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Transformations - Joint Probability Mass Function

Let X1 and X2 have the joint pdf h(x1, x2)= 2e^(-X1-X2), 0<X1<X2<infinity, zero elsewhere. Find the joint pdf of Y1=2X1 and Y2=X2-X1.

I'm having trouble with transforming the boundaries.

Solution Summary

This solution is provided in 71 words in an attached .doc file. It uses step-by-step equations to find the joint probability mass function.