Joint Cumulative Probability Distribution Function of X and Y:
F(a,b)=P{X<=a, Y<=b}
Joint Cummulative Mass Function of X and Y:
p(x, y)=P{X=x, Y=y}
Jointly Probability Density Function of X and Y:
P{(X,Y) belongs to C}= [dual integral (x,y) belongs to C] f(x,y)dxdy
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