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18 November, 08:20

Professor Dupré Calc gives her class 20 study questions, from which she will select 8 to be on the final exam. How many ways can she select the questions?

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  1. 18 November, 09:36
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    Since order doesn't matter, then it's a combination of 8 chosen among 20:

    20C₈ = (20!) / (20-8) ! (8!) = 125,970 ways
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