Question

2 – Simplifique: a) 8!-4! b) 7!-3! c) 11!-8! d) 13!-12!

Answer 1

Explicação passo-a-passo:

$a)\\ {8!\over4!}={8.7.6.5.\not4!\over\not4!}=8.7.6.5=1680\\ \\ b)\\ {7!\over3!}={7.6.5.4.\not3!\over\not3!}=7.6.5.4=840$

$c)\\ {11!\over8!}={11.10.9.\not8!\over\not8!}=11.10.9=990\\ \\ d)\\ {13!\over12!}={13.1\not2!\over\not12!}=13$