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How many sets A exist for which \(\{1, 2\} \subseteq A \subseteq \{1, 2, 3, 4, 5\}\)?

 Jan 7, 2020
 #1
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+5

  A = 

{1, 2}

{1 , 2, 3}

{1, 2, 4}

{1, 2, 5}

{1, 2, 3, 4}

{1, 2, 3, 5}

{1, 2, 4, 5}

{1, 2, 3, 4, 5}

 

I'll leave you to count them!

 Jan 7, 2020

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