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Suppose X1 and X2 are continuous random variables with join pdf given by f(x1, x2) =...

Suppose X1 and X2 are continuous random variables with join pdf given by f(x1, x2) =
2(x1 + x2) if 0 < x1 < x2 < 1, and zero otherwise.
(a) Find P(X2 > 2X1).
(b) Find the marginal pdf of X2.
(c) Find the conditional pdf of X1 given X2 = x2.

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