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If the range of random veriable X is {...

If the range of random veriable X is {0,1,2,3,4….} with ` P(X = k) = ((k +1)a)/(3^(k)) " for " k ge 0 ` , then a is equal to

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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