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Let n(A) = 4 and n(B) = 2 onto mapping A...

Let n(A) = 4 and n(B) = 2 onto mapping `A to B` are A = {1,2,4}, B = {2,4,5} and C = {2,5}, then find the number of terms of `(A-B)xx(B-C)` are_____

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