If A and B are two events such that A B, then P , ( B A ) = - Vidyadip

Question

If $A$ and $B$ are two events such that $A \subseteq B,$ then $P\,\left( {\frac{B}{A}} \right) = $

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Answer

b
(b) Since $A \subseteq B \Rightarrow A \cap B = B \cap A = A$

Hence $P\left( {\frac{B}{A}} \right) = \frac{{P(B \cap A)}}{{P(A)}} = \frac{{P(A)}}{{P(A)}} = 1$.

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