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If X is a Poisson variate and P(X=1)=2P(...

If X is a Poisson variate and P(X=1)=2P(X=2) them P(X=3)=

A

`(e^(1))/(6)`

B

`(e^(2))/(2)`

C

`(e^(-1))/(2)`

D

`(e^(-1))/(3)`

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A
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