Is this argument valid?

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Is this argument valid?




  1. No one under 18 is permitted to vote.

  2. No faculty member is under 18.

  3. The philosophy chairperson is a faculty member.

  4. Conclusion: The philosophy chairperson is permitted to vote.



My answer was it is not valid because the conclusion don't follow from the premises.










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  • Wait. Philosophy chairperson is a faculty member -> philosophy chairperson is 18 years old or older -> philosophy chairperson is permitted to vote. The argument is sound. And "the conclusion don't follow from the premises." is not what validity means.
    – rus9384
    5 hours ago










  • I'm sorry, to avoid gamesmanship here on the forum... are you asking about the argument ending in "Then the philosophy chairperson..." ? or the one ending in "My answer was it is not..."?
    – elliot svensson
    5 hours ago










  • I'm asking if my answer was correct or not
    – Abdullah O. Alfaqir
    5 hours ago










  • What you might need to add is why the conclusion does not follow from the premises, not just assert that it doesn't follow from the premises. What were your reasons? Welcome to this SE!
    – Frank Hubeny
    1 hour ago














up vote
1
down vote

favorite












Is this argument valid?




  1. No one under 18 is permitted to vote.

  2. No faculty member is under 18.

  3. The philosophy chairperson is a faculty member.

  4. Conclusion: The philosophy chairperson is permitted to vote.



My answer was it is not valid because the conclusion don't follow from the premises.










share|improve this question









New contributor




Abdullah O. Alfaqir is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.



















  • Wait. Philosophy chairperson is a faculty member -> philosophy chairperson is 18 years old or older -> philosophy chairperson is permitted to vote. The argument is sound. And "the conclusion don't follow from the premises." is not what validity means.
    – rus9384
    5 hours ago










  • I'm sorry, to avoid gamesmanship here on the forum... are you asking about the argument ending in "Then the philosophy chairperson..." ? or the one ending in "My answer was it is not..."?
    – elliot svensson
    5 hours ago










  • I'm asking if my answer was correct or not
    – Abdullah O. Alfaqir
    5 hours ago










  • What you might need to add is why the conclusion does not follow from the premises, not just assert that it doesn't follow from the premises. What were your reasons? Welcome to this SE!
    – Frank Hubeny
    1 hour ago












up vote
1
down vote

favorite









up vote
1
down vote

favorite











Is this argument valid?




  1. No one under 18 is permitted to vote.

  2. No faculty member is under 18.

  3. The philosophy chairperson is a faculty member.

  4. Conclusion: The philosophy chairperson is permitted to vote.



My answer was it is not valid because the conclusion don't follow from the premises.










share|improve this question









New contributor




Abdullah O. Alfaqir is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











Is this argument valid?




  1. No one under 18 is permitted to vote.

  2. No faculty member is under 18.

  3. The philosophy chairperson is a faculty member.

  4. Conclusion: The philosophy chairperson is permitted to vote.



My answer was it is not valid because the conclusion don't follow from the premises.







logic






share|improve this question









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Abdullah O. Alfaqir is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









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edited 5 hours ago









Eliran H

4,02521133




4,02521133






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asked 6 hours ago









Abdullah O. Alfaqir

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84




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New contributor





Abdullah O. Alfaqir is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






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Check out our Code of Conduct.











  • Wait. Philosophy chairperson is a faculty member -> philosophy chairperson is 18 years old or older -> philosophy chairperson is permitted to vote. The argument is sound. And "the conclusion don't follow from the premises." is not what validity means.
    – rus9384
    5 hours ago










  • I'm sorry, to avoid gamesmanship here on the forum... are you asking about the argument ending in "Then the philosophy chairperson..." ? or the one ending in "My answer was it is not..."?
    – elliot svensson
    5 hours ago










  • I'm asking if my answer was correct or not
    – Abdullah O. Alfaqir
    5 hours ago










  • What you might need to add is why the conclusion does not follow from the premises, not just assert that it doesn't follow from the premises. What were your reasons? Welcome to this SE!
    – Frank Hubeny
    1 hour ago
















  • Wait. Philosophy chairperson is a faculty member -> philosophy chairperson is 18 years old or older -> philosophy chairperson is permitted to vote. The argument is sound. And "the conclusion don't follow from the premises." is not what validity means.
    – rus9384
    5 hours ago










  • I'm sorry, to avoid gamesmanship here on the forum... are you asking about the argument ending in "Then the philosophy chairperson..." ? or the one ending in "My answer was it is not..."?
    – elliot svensson
    5 hours ago










  • I'm asking if my answer was correct or not
    – Abdullah O. Alfaqir
    5 hours ago










  • What you might need to add is why the conclusion does not follow from the premises, not just assert that it doesn't follow from the premises. What were your reasons? Welcome to this SE!
    – Frank Hubeny
    1 hour ago















Wait. Philosophy chairperson is a faculty member -> philosophy chairperson is 18 years old or older -> philosophy chairperson is permitted to vote. The argument is sound. And "the conclusion don't follow from the premises." is not what validity means.
– rus9384
5 hours ago




Wait. Philosophy chairperson is a faculty member -> philosophy chairperson is 18 years old or older -> philosophy chairperson is permitted to vote. The argument is sound. And "the conclusion don't follow from the premises." is not what validity means.
– rus9384
5 hours ago












I'm sorry, to avoid gamesmanship here on the forum... are you asking about the argument ending in "Then the philosophy chairperson..." ? or the one ending in "My answer was it is not..."?
– elliot svensson
5 hours ago




I'm sorry, to avoid gamesmanship here on the forum... are you asking about the argument ending in "Then the philosophy chairperson..." ? or the one ending in "My answer was it is not..."?
– elliot svensson
5 hours ago












I'm asking if my answer was correct or not
– Abdullah O. Alfaqir
5 hours ago




I'm asking if my answer was correct or not
– Abdullah O. Alfaqir
5 hours ago












What you might need to add is why the conclusion does not follow from the premises, not just assert that it doesn't follow from the premises. What were your reasons? Welcome to this SE!
– Frank Hubeny
1 hour ago




What you might need to add is why the conclusion does not follow from the premises, not just assert that it doesn't follow from the premises. What were your reasons? Welcome to this SE!
– Frank Hubeny
1 hour ago










2 Answers
2






active

oldest

votes

















up vote
3
down vote



accepted










The argument is invalid. In fact, it's an instance of the fallacy of denying the antecedent.



To see this, we can formalize the argument as follows:




  1. Under-18 → not Permitted

  2. Faculty → not Under-18

  3. Chair is Faculty



From 2 and 3 we can deduce that Chair is not under 18. But we cannot then deduce from this and 1 that Chair is permitted to vote: that would commit the fallacy of denying the antecedent.



Another way to see that the argument is invalid is to imagine a scenario where the premises are true and the conclusion is false. For example, the chairperson might not be permitted to vote because they are not a citizen (which isn't ruled out by the premises). If it's possible for the premises to be true and the conclusion false, then the argument is invalid.






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  • I used the star test by Harry j. Gensler and that's why my answer was invalid.
    – Abdullah O. Alfaqir
    5 hours ago

















up vote
1
down vote













I arrived at the same conclusion (invalidity) as Eliran H, but for a different reason. The premises are insufficient to show, affirmatively, that persons 18 years old and older are permitted to vote. Missing that information, the reasoning fails.



Here are my notes on my attempt to reason it through:



  1. If Person is Underage, then they are not permitted to Vote.

1.1 If Person is permitted to Vote, then they are not Underage. Contrapositive of #1 (looking for an affirmative statement about voting).



  1. If Person is Faculty, then they are not Underage.


  2. If Person is Chairperson, then they are Faculty.


Partial (valid) Conclusion: If Person is Chairperson, then they are not Underage. (#2 + #3)



  1. Final (failed) Conclusion: If Person is Chairperson, then they are permitted to Vote.





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    2 Answers
    2






    active

    oldest

    votes








    2 Answers
    2






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes








    up vote
    3
    down vote



    accepted










    The argument is invalid. In fact, it's an instance of the fallacy of denying the antecedent.



    To see this, we can formalize the argument as follows:




    1. Under-18 → not Permitted

    2. Faculty → not Under-18

    3. Chair is Faculty



    From 2 and 3 we can deduce that Chair is not under 18. But we cannot then deduce from this and 1 that Chair is permitted to vote: that would commit the fallacy of denying the antecedent.



    Another way to see that the argument is invalid is to imagine a scenario where the premises are true and the conclusion is false. For example, the chairperson might not be permitted to vote because they are not a citizen (which isn't ruled out by the premises). If it's possible for the premises to be true and the conclusion false, then the argument is invalid.






    share|improve this answer




















    • I used the star test by Harry j. Gensler and that's why my answer was invalid.
      – Abdullah O. Alfaqir
      5 hours ago














    up vote
    3
    down vote



    accepted










    The argument is invalid. In fact, it's an instance of the fallacy of denying the antecedent.



    To see this, we can formalize the argument as follows:




    1. Under-18 → not Permitted

    2. Faculty → not Under-18

    3. Chair is Faculty



    From 2 and 3 we can deduce that Chair is not under 18. But we cannot then deduce from this and 1 that Chair is permitted to vote: that would commit the fallacy of denying the antecedent.



    Another way to see that the argument is invalid is to imagine a scenario where the premises are true and the conclusion is false. For example, the chairperson might not be permitted to vote because they are not a citizen (which isn't ruled out by the premises). If it's possible for the premises to be true and the conclusion false, then the argument is invalid.






    share|improve this answer




















    • I used the star test by Harry j. Gensler and that's why my answer was invalid.
      – Abdullah O. Alfaqir
      5 hours ago












    up vote
    3
    down vote



    accepted







    up vote
    3
    down vote



    accepted






    The argument is invalid. In fact, it's an instance of the fallacy of denying the antecedent.



    To see this, we can formalize the argument as follows:




    1. Under-18 → not Permitted

    2. Faculty → not Under-18

    3. Chair is Faculty



    From 2 and 3 we can deduce that Chair is not under 18. But we cannot then deduce from this and 1 that Chair is permitted to vote: that would commit the fallacy of denying the antecedent.



    Another way to see that the argument is invalid is to imagine a scenario where the premises are true and the conclusion is false. For example, the chairperson might not be permitted to vote because they are not a citizen (which isn't ruled out by the premises). If it's possible for the premises to be true and the conclusion false, then the argument is invalid.






    share|improve this answer












    The argument is invalid. In fact, it's an instance of the fallacy of denying the antecedent.



    To see this, we can formalize the argument as follows:




    1. Under-18 → not Permitted

    2. Faculty → not Under-18

    3. Chair is Faculty



    From 2 and 3 we can deduce that Chair is not under 18. But we cannot then deduce from this and 1 that Chair is permitted to vote: that would commit the fallacy of denying the antecedent.



    Another way to see that the argument is invalid is to imagine a scenario where the premises are true and the conclusion is false. For example, the chairperson might not be permitted to vote because they are not a citizen (which isn't ruled out by the premises). If it's possible for the premises to be true and the conclusion false, then the argument is invalid.







    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered 5 hours ago









    Eliran H

    4,02521133




    4,02521133











    • I used the star test by Harry j. Gensler and that's why my answer was invalid.
      – Abdullah O. Alfaqir
      5 hours ago
















    • I used the star test by Harry j. Gensler and that's why my answer was invalid.
      – Abdullah O. Alfaqir
      5 hours ago















    I used the star test by Harry j. Gensler and that's why my answer was invalid.
    – Abdullah O. Alfaqir
    5 hours ago




    I used the star test by Harry j. Gensler and that's why my answer was invalid.
    – Abdullah O. Alfaqir
    5 hours ago










    up vote
    1
    down vote













    I arrived at the same conclusion (invalidity) as Eliran H, but for a different reason. The premises are insufficient to show, affirmatively, that persons 18 years old and older are permitted to vote. Missing that information, the reasoning fails.



    Here are my notes on my attempt to reason it through:



    1. If Person is Underage, then they are not permitted to Vote.

    1.1 If Person is permitted to Vote, then they are not Underage. Contrapositive of #1 (looking for an affirmative statement about voting).



    1. If Person is Faculty, then they are not Underage.


    2. If Person is Chairperson, then they are Faculty.


    Partial (valid) Conclusion: If Person is Chairperson, then they are not Underage. (#2 + #3)



    1. Final (failed) Conclusion: If Person is Chairperson, then they are permitted to Vote.





    share|improve this answer
























      up vote
      1
      down vote













      I arrived at the same conclusion (invalidity) as Eliran H, but for a different reason. The premises are insufficient to show, affirmatively, that persons 18 years old and older are permitted to vote. Missing that information, the reasoning fails.



      Here are my notes on my attempt to reason it through:



      1. If Person is Underage, then they are not permitted to Vote.

      1.1 If Person is permitted to Vote, then they are not Underage. Contrapositive of #1 (looking for an affirmative statement about voting).



      1. If Person is Faculty, then they are not Underage.


      2. If Person is Chairperson, then they are Faculty.


      Partial (valid) Conclusion: If Person is Chairperson, then they are not Underage. (#2 + #3)



      1. Final (failed) Conclusion: If Person is Chairperson, then they are permitted to Vote.





      share|improve this answer






















        up vote
        1
        down vote










        up vote
        1
        down vote









        I arrived at the same conclusion (invalidity) as Eliran H, but for a different reason. The premises are insufficient to show, affirmatively, that persons 18 years old and older are permitted to vote. Missing that information, the reasoning fails.



        Here are my notes on my attempt to reason it through:



        1. If Person is Underage, then they are not permitted to Vote.

        1.1 If Person is permitted to Vote, then they are not Underage. Contrapositive of #1 (looking for an affirmative statement about voting).



        1. If Person is Faculty, then they are not Underage.


        2. If Person is Chairperson, then they are Faculty.


        Partial (valid) Conclusion: If Person is Chairperson, then they are not Underage. (#2 + #3)



        1. Final (failed) Conclusion: If Person is Chairperson, then they are permitted to Vote.





        share|improve this answer












        I arrived at the same conclusion (invalidity) as Eliran H, but for a different reason. The premises are insufficient to show, affirmatively, that persons 18 years old and older are permitted to vote. Missing that information, the reasoning fails.



        Here are my notes on my attempt to reason it through:



        1. If Person is Underage, then they are not permitted to Vote.

        1.1 If Person is permitted to Vote, then they are not Underage. Contrapositive of #1 (looking for an affirmative statement about voting).



        1. If Person is Faculty, then they are not Underage.


        2. If Person is Chairperson, then they are Faculty.


        Partial (valid) Conclusion: If Person is Chairperson, then they are not Underage. (#2 + #3)



        1. Final (failed) Conclusion: If Person is Chairperson, then they are permitted to Vote.






        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 43 mins ago









        Mark Andrews

        2,170621




        2,170621




















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