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If the [robability that the random varia...

If the [robability that the random variable X takes x is given by `P(X=x)=k(x-1)3^(-x), x=0,1,2,3, . . .` , where k is a constant, then `P(X ge 2)` is equal to

A

`7/18`

B

`7/27`

C

`20/27`

D

`11/18`

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