Question

simplificando 10!/8! obtemos

Answer 1

10! / 8! = 10 x 9 x 8! / 8!  corta os termos iguais, fica = 10 x 9 = 90

Answer 2

10!/8! = 10.9.8.7.6.5.4.3.2.1/8.7.6.5.4.3.2.1 = 10.9 = 90