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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

`n/1+1/2`

B

`n/3+1/6`

C

`n/2+1/5`

D

none of these

Text Solution

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The correct Answer is:
B
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