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How many subsets of the set {1,2,3,4,5,...,10} contain the number 5?

 Aug 12, 2021
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The  number of total  subsets =   2^10  =  1024  (including the empty set)

 

The number   that  DON'T  contain  "5 "  =   2^9  =  512  (including the empty set)

 

So....the  number that DO  contain  "5"  =    1024  - 512  = 512

 

 

cool cool cool  

 Aug 12, 2021

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