A random variable X has the following p....

A random variable X has the following p.m.f.

If `p+q=1`, then the variance of X is

A

(a) `p^2`

B

(b) `2pq`

C

(c) `p^(2)+q^(2)`

D

(d) `p^(2)-q^(2)`

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The correct Answer is:

B

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