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Let Y= (1, 2, 3, 4, 5}, A = {1, 2). B =...

Let `Y= (1, 2, 3, 4, 5}, A = {1, 2). B = (3, 4, 5)` If `(A xx B)` denotes Cartesian product of the set A and B, then number of elements in `(Y xx A)nn (Y xx B)` is ______

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`phi`

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