Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    0
    ReputationRep:
    I'm a little stumped here. give us a hand?

    iv. The following arguments are all invalid. Prove this by finding, in each case, an argument with the same logical form whose premises are known to be true and whose conclusion is known to be false (the ‘counterexample technique’). (8 marks)

    a. Most logicians are philosophers; few philosophers are unwise; so at least some logicians are wise.

    b. Few Sicilians approve of abortion; many atheists approve of abortion; so few atheists are Sicilian.

    c. Some nerds are trainspotters; some nerds wear parkas; so some trainspotters wear parkas.

    d. Many ordinary people are corrupt; all politicians are ordinary people; so some politicians are corrupt.


    need to hand this in by 5pm so all help much appreciated. thanks.
    x
    Offline

    13
    ReputationRep:
    c: Most Bananas are fruit, most fruit are round, so at least some bananas are round.

    both premises are true, as most bananas are indeed fruit (they all are) and most fruit are round (but not all). The conclusion is false, as there are no round bananas. Thus, the argument is invalid.

    C: was the easyest to do, as the others require a bit more explanation, but i hope you get the gist. Find examples to replace the existing premises that are true, but make sure that they create a false conclusion to show that the argument is invalid.
    Offline

    15
    ReputationRep:
    Someone goes to Lancaster and is doing first year Philosophy...

    EDIT: And for future reference, you need to hand your work in by 4pm, not 5pm.
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Did TEF Bronze Award affect your UCAS choices?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.