Question

resolva a expressao 3C5,2 + 3C8,6 - 17

Answer 1

$3. C_{5,2} + 3. C_{8,6} - 17$

$3 . \frac{5!}{(5-2)! 2!} + 3. \frac{8!}{(8-6)!.6!} -17$

$3. \frac{5.4.3!}{3! . 2} + 3. \frac{8.7.6!}{2 . 6!} - 17$

$3 . 5 . 2 + 3.4.7 - 17$

$30 + 84 - 17 = 97$