Question: Let random variable X follow the zero-truncated Poisson () distribution. This distribution arises, for example, as a prior for the number of components in mixture

 Let random variable X follow the zero-truncated Poisson (λ) distribution.

This distribution arises, for example, as a prior for the number of components in mixture models. Calculate the p.m.f. of X, E[X] and V (X).

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