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12-04-2015
Mathematics

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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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12-04-2015

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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