Is there any chance that : Covarience (X,Y) = Varx + Vary - 2*Var(X,Y) or it has to be Covarience (X,Y) = Varx + Vary + 2*Var(X,Y) and please explain
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Is there any chance that :
Covarience (X,Y) = Varx + Vary + 2*Var(X,Y)
and please explain
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