1)Suppose that the conclusion of an argument is that some of the As are not Bs

1)Suppose that the conclusion of an argument is that some of

the As are not Bs. Which of the following premises would make the argument valid?
a)      All of the As are Bs
b)     None of the As are Bs
c)      Some of the As are Bs
d)     Some of the As are not Bs


2)Suppose that P and Q are contradictory propositions. Which of the following is then true
a)  At least one of them is false
b) They can both be true
c)  At least one of them is true
d) They can both be false


3)If we know that all of the As are Bs, then which of the following must also be true.
a)  Some of the As are not Bs
b) Some of the Bs are not As
c)  Some of the As are Bs


4)Which of the following claims about validity are true?
(select all the correct answers.)
a)  An argument with a conditional premise is never valid
b) A valid argument always has a true conclusion
c)  Every argument is either valid or invalid
d) An argument with true premises is always valid


5. If two propositions are contraries, then they can both be true but they cannot both be false.
a)  True
b) False


6. Any argument with true premises and a false conclusion is invalid.
a.  True
b. False


7. What is the name of the logical relation between the following two propositions:
  All cats are animals.
  Some cats are not animals.
a)  Contrary
b) Subcontrary
c)  Contradictory


8. If P and Q are subcontraries, then they can both be false.
a.  True
b. False


9. If you know that some of the As are Bs, then which of the following MIGHT also be true.
a.  None of the As are Bs
b. Some of the Bs are not As
c.  Some of the As are not Bs
d. All of the As are Bs