(adsbygoogle = window.adsbygoogle || []).push({}); Marginal Probability function????Anyone

I have this question which I cannot seem to solve:

The joint probability mass function p(x, y) of two discrete random variables X and Y is given by.

p(x,y) = ([5^x][7^y][e^-5])/x!(y-x)!

x and y are non-negative integers and x <= y

(i) Find the marginal probability mass functions of X and Y.

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# Marginal Probability function?Anyone

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