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Find the number N of surjective (onto) functions from a set A to a set B...

Find the number N of surjective (onto) functions from a set A to a set B where:

(a) |A| = 8, |B| = 3; (b) |A| = 6, |B| = 4; (c) |A| = 5,|B| = 5; (d) |A| = 5, |B| = 7.

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