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1. How many ways can you distribute 4 different balls among 4 different boxes, if at least one box must be empty?

 

2. How many ways can you distribute 4 identical balls among 4 identical boxes, if at least one box must be empty?

 Aug 3, 2021
 #1
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The second one should be easy.  Give it a go and discuss your thoughts here.

 Aug 9, 2021

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