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## Homework Statement

X

_{1}and X

_{2}are two independent discrete random variables with

P(X

_{1}= k) = c3

^{-k}

P(X

_{2}= k) = d4

^{-k}

for k in natural numbers and where X

_{1}, X

_{2}in natural numbers is almost always valid. 0 is not include in N.

Find constants c and d.

## Homework Equations

## The Attempt at a Solution

Since I'm joining this class late in the semester I don't know where to begin. Any help is appreciated!!