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

 Apr 16, 2020
 #1
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List them ...

{5}

{1,5}     {2,5}     {3,5}     {4,5}

{1,2,5}     {1,3,5}     {1,4,5}     (2,3,5}     {2,4,5}     {3,4,5}

{1,2,3,5}     {1,2,4,5}     {1,3,4,5}     {2,3,4,5}

{1,2,3,4,5}

 Apr 16, 2020

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