Question: Random variables $(X, Y)$ have the joint density functio $$ f(x, y)=left{begin{aligned} k(6-x-y), & O

Random variables $(X, Y)$ have the joint density functio $$ f(x,

Random variables $(X, Y)$ have the joint density functio $$ f(x, y)=\left\{\begin{aligned} k(6-x-y), & O

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