6. Two independent random variables X1=(-1,0,1) and X2=(-1.0) can take the following probability values: P(X1-1)-p, P(X1=0)=2p, P(X1=1)=1-3p, P(X2=-1)=p, P(X2=0)=1-p. Si X=X1+X2 y Y=X1*X2, determine E(XY).
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