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doloreshaze
@doloreshaze
November 2021
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9 класс.
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maryfine
По формуле количества сочетаний С из 10 по 2
=10! /(2!(10-2)!) =10*9/2=45
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sudsha
С
²₁₀=10!/(10-2)!*2!=9*10/2=45
Ответ:45 способов
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Answers & Comments
=10! /(2!(10-2)!) =10*9/2=45
Ответ:45 способов