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Q.

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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a

1320

b

69100

c

710

d

12

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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