Question

simplifique 51!/49! e (x-6)! / (x-4)!

Answer 1

1.

$\frac{51!}{49!}\\\\\frac{51\,.\,50\,.\,49!}{49!}\\\\51\,.\,50\\\\2550$

2.

$\frac{(x-6)!}{(x-4)!}\\\\\frac{(x-6)!}{(x-4).(x-5).(x-6)!}\\\\\frac{1}{(x-4).(x-5)}\\\\Se\;quiser\;expandir\;o\;denominador:\\\\\frac{1}{x^2-9x+20}$