Need Help finding constant C in joint pmf for two discrete variables
Determine the constant c so that f (x, y) satisfies the conditions of being a joint pmf for two discrete random variables X and Y:
f (x, y) = c(1/4)^x * (1/3)^y, where x = 1, 2, . . . , y = 1, 2, . . . .
The answer is 6, but I need help reaching this answer. Any help would be appreciated.