Let X be a set with exactly 5 element...

Let `X` be a set with exactly 5 elements and `Y` be a set with exactly 7 elements. If `alpha` is the number of one-one function from `X` to `Y` and `beta` is the number of onto function from `Y` to `X` , then the value of `1/(5!)(beta-alpha)` is _____.

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