Q: If P is false, and Q is false, the truth-value of "P ?Q" is
false.
true.
Cannot be determined.
All of the above.

A: For clarification, the following paragraph is taken from Wikipedia.
Biconditional joins two simpler propositions, and we write "above example (sic)", which is read "P if and only if Q". [ It expresses that P and Q have the same truth-value, thus P if and only if Q is true in cases 1 and 4, and false otherwise.
1. P is true and Q is true
2. P is true and Q is false
3. P is false and Q is

true
4. P is false and Q is false
Here is my answer...
Therefore, if P is false and Q is false, the truth-value of P iff (if and only if) Q is true.
"True". ]

jher000|Points 7504|

Expert answered|stell_rivs|Points 0|

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Asked 7/20/2012 10:41:07 PM

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