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Автор - gayane2485

mojete pojalosto reshit ya nekak ne magu ponyat kak reshat faktariali​

Ответ

Автор - МатематическийМозг

C^2_9=dfrac{9!}{2!*(9-2)!}=dfrac{1*2*3*4*...*8*9}{2*1*2*3*4*...*6*7}=\\\=dfrac{8*9}{2}=4*9=36

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