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Summation Using Sigma

If X is Poiss...

Question

If X is Poisson variate with P(X=0)=P(X=1), then P(X=2)=

A

\frac{e}{2}

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B

\frac{e}{6}

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C

\frac{1}{6 e}

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D

\frac{1}{2 e}

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Solution

The correct option is D $\frac{1}{2 e}$
$P (x = r) = \frac{e^{- λ} λ^{r}}{r!}$

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