Question

Ce formulă trebuie să folosesc aici

Answer 1

$C_{n}^{k} =\frac{n!}{k!(n-k)!}=C_{6}^{2}=6!/2!*4!=6*5*4!/2*4!=30/2=15$

Answer 2

$C^2_6= \frac{6!}{2!(6-2)!}= \frac{1*2*3*....*6}{1*2*4!}= \frac{3*4*5*6}{1*2*3*4}= 3*5=15 \ submultimi$