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Find the number of subsets of {1, 2, 3, ..., 12} containing four or fewer elements.

 May 19, 2020
 #1
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The  #  of  subsets are

 

12C0  + 12C1  + 12C2  + 12C3 + 12C4   =

 

 1    +    12     +   66  +  220  +  495  =

 

794

 

cool cool cool

 May 19, 2020

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