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If the probability function of a random ...

If the probability function of a random variable X is defined by `P(X=k)=a((k+1)/(2^(k)))` for k=0,1,2,3,4,5, then the probability that X takes a prime value is

A

`(13)/(20)`

B

`(23)/(60)`

C

`(11)/(20)`

D

`(19)/(60)`

Text Solution

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The correct Answer is:
B
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