The joint pdf ofX and Y is f (x,y)=kxy
for "0<x<1,0<y<1"
"\\int^1_0\\int^1_0f(x,y)dxdy=1"
"\\int^1_0\\int^1_0kxydxdy=k\\int^1_0(y\/2)dy=k\/4=1"
"k=4"
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