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math challenge II-A combinatoratics 7.23

 
 
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Re: math challenge II-A combinatoratics 7.23
by John Lensmire - Monday, October 4, 2021, 12:47 PM
 

Remember that the empty set $\emptyset = \{\}$, which is the set that contains nothing, is always a subset of any other set. Therefore, we do want to still include this outcome, giving us the $32$ subsets.