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Find the number of ways of distributing 4 different balls among 4 identical boxes.

 Feb 22, 2020
 #1
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0 + 1 + 7 + 6 + 1  = 15 ways - with no restrictions. This is Bell's 4th number, which is the sum of Stirling Numbers of the 2nd Kind(4, 0), (4,1), (4,2), (4,3) and (4,4). 

 Feb 22, 2020
 #2
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Thanks a lot man!

 Feb 28, 2020

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