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I need help proving equation 1.2:

All joint probability statements about X and Y can, in theory, be answered in terms of their joint distribution function. For

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47 by 1 mm az Xt a A={(x=Qz) of ye bz)} B={(x = az)n(456)} C= {\xsa, ) n (Ys bz?} D= {(x524) n (5 b)} E={{@xxsar) (6, <4€ b)}

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