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The p.m.f. of a r.v. X is P(x) = {((2x)/...

The p.m.f. of a r.v. X is `P(x) = {((2x)/(n(n+1)), x=1","2","....","n),(0, "otherwise"):}`
Then E(X) =

A

`(2n+1)/(3)`

B

`(n+2)/(3)`

C

`(2n+1)/(6)`

D

`(n+2)/(6)`

Text Solution

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The correct Answer is:
A
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