If a number is a selected at random from first 100 natural numbers then the probability that the number is a two digited number with at least one even digit either at the begining or ending is

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1320

69100

710

answer is A.

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Detailed Solution

n(S)=C1 100=100 n(E)=C1 4.C1 5+C1 5.C1 5+C1 4.C1 5=65P(E)=65100=1320

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