Question

cu cat egal combinari de 5 luate cate 2?

Answer 1

Te folosesti de formula : combinari de n luate cate k : n!/(n-k)!*k!

Raspunsul final e 20/2=10.

Answer 2

C₅² = 5! /[(5-2)! x 2!] = 5! / 3!x2! = 5 x 4 x 3! / (3! x 2 x 1 ) = 20 / 2 = 10