18. It is a fact that C2 = 15. Demonstrate this explicitly by showing that there are 15 ways to choose 2 letters from the set of 6 letters ABCDEF. List all 15 combinations. Remember that order doesn't matter when you use the "C" formula. %3D

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18. It is a fact that C2 = 15. Demonstrate this explicitly by showing that there are 15 ways to choose 2
letters from the set of 6 letters A B C DEF. List all 15 combinations. Remember that order doesn’t
matter when you use the “C" formula.
Transcribed Image Text:18. It is a fact that C2 = 15. Demonstrate this explicitly by showing that there are 15 ways to choose 2 letters from the set of 6 letters A B C DEF. List all 15 combinations. Remember that order doesn’t matter when you use the “C" formula.
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