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Two variables, X and Y assume the values X1=2, X2=-5, X3=4, X4=-8 and Y1=-3, Y2=-8, Y3=10, Y4=6, respectively. Calculate (a) ? X, (b) ? Y, (c) ? X2, (d) ? Y2, (e) ? XY (f) (? X)( ? Y), (g) ? XY2, and (h) ? (X+Y)(X-Y).