Suppose X, Y, and Z are random variables with joint density function f (x, y, z) =

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Suppose X, Y, and Z are random variables with joint density function f (x, y, z) = Ce-(0.5x+0.2y+0.1z) if x > 0, y > 0, z > 0,
and f (x, y, z) = 0 otherwise.
(a) Find the value of the constant C.
(b) Find P(X < 1, Y < 1).
(c) Find P(X < 1, Y < 1, Z < 1).

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