The joint density function for a pair of random variables X and Y is given. (Round your answers to four decimal places.) Cx(1+y) if 0 ≤ x ≤ 6,0 ≤ y ≤ 4 otherwise - 0 (a) Find the value of the constant C. f(x, y) = (b) Find P(X ≤ 1, Y ≤ 1). (c) Find P(X + Y ≤ 1).

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