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Find the number of all one-one functions...

Find the number of all one-one functions from set `A={1,2,3}` to itself.

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One-one function from .[1,2,3]. to itself is simply a permutation on three symbols. .1,2,0 ..
:., total number of one-oné maps from .{1,2,3}. to itself is sameas total number of permutations on three symbols .1,2,3. which is .3 !=6.
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