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Let f : A → B be function, where A = {1,2,3,4,5,6} and B = {1,2,3,4,5}.

If f(1) = 4 then how many surjective (onto) functions are possible ?
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related theory https://math.stackexchange.com/questions/334420/number-of-onto-functions

formula derivation is in given link

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