Question

Is the following a probability mass function (probability distribution function)? Show why or why not. P(X=x)...

Is the following a probability mass function (probability distribution function)? Show why or why not.

P(X=x) = 3 / (4 *(3-X)! *X!)        for x = 0, 1, 2, 3

                                                  and zero elsewhere

What do they mean by, "and zero elsewhere", other than that I understand the question. Thanks!

Math   Statistics-And-Probability   
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TOPIC:Conditions for being a valid pmf.

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