1. The problem statement, all variables and given/known data X1 and X2 are two independent discrete random variables with P(X1 = k) = c3-k P(X2 = k) = d4-k for k in natural numbers and where X1, X2 in natural numbers is almost always valid. 0 is not include in N. Find constants c and d. 2. Relevant equations 3. 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!!