Let X and Y be independent random variables with joint probability density function fxy(x, y) = 1/3 (x+y), 0 < x <= 2, and 0 < y<= 1, and 0 otherwise. The marginal pdf fx(x) is given by O a. O b. О с. O d. (2+2X)/3 (2 + 2X)/3 (X+1/2)/3 (X+1/2)/3 0 < X <= 2 0 < X <= 1 0

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