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Q.14.     If A and B are two events such that A\subset B  and P(B)\neq 0, then which of the following is correct?

                (A) P(A\mid B)=\frac{P(B)}{P(A)}

                (B) P(A\mid B)< P(A)

                (C) P(A\mid B)\geq P(A)

                (D) None of these

Answers (1)

best_answer

If  A\subset B  and P(B)\neq 0,then

                \Rightarrow \, \, \, (A\cap B) = A

 Also, P(A)< P(B)

P(A|B)=\frac{P(A\cap B)}{P(B)}=\frac{P(A)}{P(B)}

We know that P(B)\leq 1

                       1\leq \frac{1}{P(B)}

                    P(A)\leq \frac{P(A)}{P(B)}

                   P(A)\leq P(A|B)

Hence, we can see option C is correct.

Posted by

seema garhwal

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