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22 November, 09:55

An amusement park has 20 different rides. You want to ride at least 15 of them. How many different combinations of rides can you go on?

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  1. 22 November, 12:48
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    There are 15,504 different groups of 15 rides that you can select out of 20 available ones. That's (20!) / (5! * 15!).
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