If $A$ and $B$ are two events and $A \neq \phi, B \neq \phi$, then
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → $P(A \mid B) = \frac{P(A \cap B)}{P(B)}$ ##
If $A \neq \phi$ and $B \neq \phi$, then $P(A \mid B) = \frac{P(A \cap B)}{P(B)}$ [by conditional probability]