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23-07-2016
Mathematics

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A test consists of 25 problems and students are told to answer any 15 of these questions. In how many different ways can they choose the 15 questions?

Respuesta :

23-07-2016

The number of combinations of 25 problems taken 15 at a time is:
[tex]25C15=\frac{25!}{15!10!}=3,268,760[/tex]

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