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If the range of a random variable X is {...

If the range of a random variable X is {0,1,2,3 …..,} with `P(X = k) = ((k +1))a/3^(k)` for ` k ge 0,` then a =

A

2/3

B

4/9

C

8/27

D

16/81

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The correct Answer is:
B
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