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A random variable X has its range {1,2,3...

A random variable X has its range {1,2,3}. If `P(X=1)=1//6, P(X=2)=1//3.P(X=3)=1//2` then mean =

A

`7//3`

B

`5//3`

C

`4//3`

D

`1//3`

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The correct Answer is:
A
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