Question

qual o valor de C7,5?

Answer 1

C7,5 = 7! / 5! (7 – 5)! = 7! / 5! 2! = (7.6.5.4.3.2.1)/(5.4.3.2.1.2.1) = 21

Answer 2

Olá Reabrahao

C(n,k) = n!/(k!*(n - k)!

C(7,5) = 7!/(5!*2!) 

7*6*5!/5!2! = 42/2 = 21 

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