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OpenStudy (anonymous):
If p(x1,x2)=(2/3)^(x1+x2)(1/3)^(2-x1-x2), (x1,x2)= (0,0), (0,1), (1,0), (1,1), zero elsewhere, is the joint pmf of X1 and X2, find the joint pmf of Y1=X1-X2 and Y2=X1+X2.
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