anonymous
  • anonymous
Let A and B be nonempty finite sets with |A| = m and |B| = n If m > n, then find the number of onto functions from A to B
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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misty1212
  • misty1212
HI!!
misty1212
  • misty1212
you need the formula or an explanation?
misty1212
  • misty1212
if you just need the formula it is \[\sum_{k=0}^n(-1)^k\binom{n} {k}(n-k)^m\]

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misty1212
  • misty1212
if you need an explanation, here is a decent one http://math.stackexchange.com/questions/334420/number-of-onto-functions

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