4.1-1 For each of the following functions, determine the constant c so that f(x, y) satisfie the conditions of being a joint pmf for two discrete random variables X and Y: a. f(x, y) = c(x + 2y), x = 1, 2, y = 1, 2, 3. b. f(x, y) = c(x + y), x = 1, 2, 3, y = 1,...,x.

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