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JEE Main Mathematics question

MathematicsPermutations and CombinationsJEE Main

If , then one-one onto mappings such that , , are given by

Answer: (A)

Solution

The map must be one-one, onto, and satisfy , , . (B) and (C) send 1 to 2, so they fail the first condition (and are not even

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Question ID VK-007566