Resposta:

C 15,12.=​

C 15, 3

15.14.13/3!

2730/6

455

Explicação passo a passo:

Verified answer

[tex]C_{15}^{12}\\\\= \cfrac{15!}{12! \cdot 3!} \\\\= \cfrac{15 \cdot 14 \cdot 13 \cdot 12!}{12! \cdot 3 \cdot 2} \\\\= 5 \cdot 7 \cdot 13\\= 455[/tex]