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

The p.m.f. of a r.v. X is `P(x)={{:(kx^(2)","x=1","2","3","4),(0", otherwise"):}`, then E (X) =

A

`(10)/(3)`

B

`(5)/(3)`

C

`(100)/(3)`

D

`(50)/(3)`

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The correct Answer is:
A
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