Question: A function f from a set A to a set B is one-to-one if all distinct elements x and y in A have distinct images

A function f from a set A to a set B is one-to-one if all distinct elements x and y in A have distinct images f(x) and f(y) in B. Find the number of one-to-one functions from A to B if A has m elements and B has n elements, where n is bigger or equal to m >_

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