n! - факториал, n! = 1*2*3*4*5*6...........
Сочетание С m из n: = n! / [m! * (n - m)!]
Сочетания 2 из 7 = 7! / [2! * (7 - 2)!] = 7! / (2! * 5!) =
= (1*2*3*4*5*6*7) / [(1*2)*(1*2*3*4*5)] =21
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n! - факториал, n! = 1*2*3*4*5*6...........
Сочетание С m из n: = n! / [m! * (n - m)!]
Сочетания 2 из 7 = 7! / [2! * (7 - 2)!] = 7! / (2! * 5!) =
= (1*2*3*4*5*6*7) / [(1*2)*(1*2*3*4*5)] =21