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## Homework Statement

A random variable X has probability generating function g

_{X}(s) = (5-4s

^{2})

^{-1}

Calculate P(X=3) and P(X=4)

## Homework Equations

## The Attempt at a Solution

Ehh don't really know where to go with one... I know:

g

_{X}(s) = E(s

^{x}) = Ʃ p(X=k)(s

^{k})

Nit sure how to proceed..

Any help would be great!!

Regards

Tam