Questão 1763500

66 ∙ 455 + 220 ∙ 105.

\(\frac{12\cdot11\ \cdot10\ \cdot15\ \cdot14\ \cdot13}{5!}\) .

\(\frac{12\cdot11\ \cdot15\ \cdot14\ \cdot\left(10\ +\ 12\right)}{5!}\) .

12 ∙ 11 + 15 ∙ 14 + 10 ∙ 13.

\(\frac{12!}{2!}\ \cdot\frac{15!}{2!}\) .