1.

If a random variable X follows a poisson distribution such that P(X=1) =3P (X=2), then P(x=3)=

Answer»

`(4)/(81)e^(-(2)/(3))`
`(2)/(81)e^(-(2)/(3))`
`(2)/(27)e^(-(2)/(3))`
`(4)/(81)e^(-(1)/(3))`

Answer :A


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