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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

(a) `13/20`

B

(b) `23/60`

C

(c) `11/20`

D

(d) `19/60`

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The correct Answer is:
B
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