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Suppose that the random variables X and Y have the following joint probability density function. f ( x , y ) = ce 7 x

Suppose that the random variables X and Y have the following joint probability density function.

f(x,y) = ce^{7x 9y},0 < y < x.

(a)Find the value of c.

(b)Find P(X < 18,Y < 2)

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