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If X is a Poisson variate such that P(X = 2) = 9P(X = 4) + 90P(X = 6), then find Var (X).

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If X is a Poisson variate such that P(X = 2) = 9P(X = 4) + 90P(X = 6), then find Var (X). 

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⇒ λ = 1 ⇒ Variance = λ = 1

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