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The number of all one-one functions from set A= { 1, 2, 3} to itself is

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answer is B.

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Detailed Solution

One-one function from {l, 2, 3} to itself is simply a permutation on three symbols 1, 2, 3. Therefore, total number of one-one maps from {l, 2, 3} to itself is same as total number of permutations on symbols 1, 2, 3, which is 3! = 6.

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