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A random variable X has its range {0,1,2...

A random variable X has its range {0,1,2,3,………}. If `P(X=r)=(c(r+1))/(2^(r))` for r=0,1,2,……….. Then c=

A

`1//2`

B

`1//3`

C

`1//4`

D

`1//5`

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The correct Answer is:
C
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