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Let $A$ and $B$ be two non-null events such that $A \subset B$. Then, which of the following statements is always correct?
(1) $P(A|B) = P(B) - P(A)$
(2) $P(A|B) \geq P(A)$
(3) $P(A|B) \leq P(A)$
(4) $P(A|B) = 1$
$A \subset B \Rightarrow A \cap B = A$. $P(A|B) = \frac{P(A)}{P(B)}$. Since $P(B) \leq 1$, $P(A|B) \geq P(A)$.
BETA
