Question: 8. Prove that the following cannot be the joint distribution function of two randomvariables X and Y . F(x,y) = if x + y 1

8. Prove that the following cannot be the joint distribution function of two randomvariables X and Y .

F(x,y) = if x + y 1 if x + y <

F(x,y) = if x + y 1 if x + y < 1.

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