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October 25, 2014

Homework Help: Phi103

Posted by johnson on Monday, December 12, 2011 at 3:37pm.

What is the truth value of the sentence "P v ~ P"? (Points : 1)
True
False
Cannot be determined
Not a sentence

2. One of the disadvantages of using truth tables is (Points : 1)
it is difficult to keep the lines straight
T's are easy to confuse with F's.
they grow exponentially and become too large for complex arguments.
they cannot distinguish strong inductive arguments from weak inductive arguments.

3. "P v Q" is best interpreted as (Points : 1)
P or Q but not both P and Q
P or Q or both P and Q
Not both P or Q
P if and only if Q

4. In the truth table for an invalid argument, (Points : 1)
on at least one row, where the premises are all true, the conclusion is true.
on at least one row, where the premises are all true, the conclusion is false.
on all the rows where the premises are all true, the conclusion is true.
on most of the rows, where the premises are all true, the conclusion is true.

5. What is the truth value of the sentence "P & ~ P"? (Points : 1)
True
False
Cannot be determined
Not a sentence

6. If P is false, and Q is false, the truth-value of "P ↔Q" is (Points : 1)
false.
true.
Cannot be determined.
All of the above.

7. A sentence is said to be truth-functional if and only if (Points : 1)
the sentence might be true.
the truth-value of the sentence cannot be determined from the truth values of its components.
the truth-value of the sentence is determined always to be false.
the truth-value of the sentence can be determined from the truth values of its components.

8. Truth tables can (Points : 1)
display all the possible truth values involved with a set of sentences.
determine what scientific claims are true.
determine if inductive arguments are strong.
determine if inductive arguments are weak.

9. The truth table for a valid deductive argument will show (Points : 1)
wherever the premises are true, the conclusion is true.
that the premises are false.
that some premises are true, some premises false.
wherever the premises are true, the conclusion is false.

10. In the conditional "P → Q," "Q is a (Points : 1)
sufficient condition for Q.
sufficient condition for P.
necessary condition for P.
necessary condition for Q.

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