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Let X be a set with exactly 5 elements and Y be a set with exactly 7 elements. If α is the number of oneone functions from X to Y

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

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