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Natasha6303
@Natasha6303
April 2021
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Сколькими способами можно выбрать 5 фильмов из 9 различных?
1) 126 2) 3024 3) 5 4) 45
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126 - это число сочетаний без повторений из 9 элементов по 5. = C(n, k) = n!/ (k! (n-k)!) где n! - n факториал 9! = 362880, 5! = 120, (9-4)! = 24. C(9, 5) = 362880 / (120*24) = 126
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