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Verify that if 2xx ""^(7)C(4)= ""^(17)C(...

Verify that if `2xx ""^(7)C_(4)= ""^(17)C_(8)`.

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If A = [1,2,3], B=[4], C= [5] , then verify that: (i) A xx (B uu C) = (A xx B) uu (A xx C) (ii) A xx (B nn C) = (A xx B) nn (A xx C)