Question

question 15
what does \p ⇔ q\ mean?
none of the above.
p is true if and only if q is true
p and q contradict
p implies q, but not vice versa

Explanation:

The symbol $\Leftrightarrow$ represents a biconditional statement in logic. It means that $P$ is true if and only if $Q$ is true, indicating that $P$ and $Q$ have the same truth - value.

Answer:

P is true if and only if Q is true