An envelope contains eight bills: 2 ones, 2 fives, 2 tens, and 2 twenties. Two bills are drawn without replacement. How many ways are there such that their sum is 20 or more? ( ) A. 10 B. 12 C. 13 D. 14 E. 20
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First, we can list all the possible pairs of bills that can be drawn without replacement: (1, 1), (1, 5), (1, 10), (1, 20), (5, 1), (5, 5), (5, 10), (5, 20), (10, 1), (10, 5), (10, 10), (10, 20), (20, 1), (20, 5), (20, 10), (20, 20) Show more…
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