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If the probability mass function of a di...

If the probability mass function of a discrete random variable X is `P(x)=(C)/(x^(3)),x=1,2,3=0`, otherwise. Then, E(X) is equal to

A

`(343)/(297)`

B

`(294)/(251)`

C

`(297)/(294)`

D

`(251)/(294)`

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The correct Answer is:
D
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