Question: Let X be a set with exactly 5 elements and Y be a set with exactly 7 elements. If ? is the number of one-one

Let X be a set with exactly 5 elements and Y be a set with exactly 7 elements. If ? is the number of one-one functions from X to Y and ? is the number of onto functions from Y to X, then the value of (1/5!)(? – ?) is

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