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If A = {1, 2, 3, 4} and B = {2, 3, 4} then find the number of one-one onto functions between A and B.

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If A = {1, 2, 3, 4} and B = {2, 3, 4} then find the number of one-one onto functions between A and B.

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Since the number of elements of A and B are not same, so the number of one-one onto function is 0.

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