Q .     If `X` has a binomial distribution, `B(n, p)` with parameters `n` and `p` such that `P(X=2)=P(X=3)`, then `E(X)`, the mean of variable `X`, is :

JEE 2014 Mains Paper 1
A

`3-p`

B

`p/2`

C

`p/3`

D

`2-p`

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