Un-ordered distribution
Probability
Level
2
You have 8 identical balls. You have 5 identical urns in which to put them. The order of the urns does not matter.
How many different ways can you distribute the balls, if you have to put at least one ball in each urn?
2
5
3
4
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1 solution
Moderator note:
Simple standard approach.
The possible distributions:
4-1-1-1-1
3-2-1-1-1
2-2-2-1-1