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Assertion (A): In a cricket match, a batsman hits a boundary $9$ times out of $45$ balls he plays. The probability that in a given ball, he does not hit the boundary is $\frac{4}{5}$.
Reason (R): $P(E) + P(\text{not } E) = 1$
Reason (R): $P(E) + P(\text{not } E) = 1$
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(A) Both Assertion (A) and Reason(R) are true and Reason (R) is the correct explanation of the Assertion (A).