Guidi Chan wrote:
> A fair die is rolled 2 times. X1 and X2 is the # of
> points showing on 1st and 2nd rolls.
>
> U = X1 + X2; V = X1 - X2.
>
> Show that U and V are NOT independent.
--snip--
> I'm basically stuck at trying to show that there not
> independent.
Try thinking about the mathematical definition of "independence" and
about the joint distribution of U and V.
Charles Metz
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