Факториал 15!/14! 8!/10! 42!/40! 16!/14!3!

Решите задачу:

$\frac{15!}{14!} = \frac{1*2*3*4*5*6*7*8*9*10*11*12*13*14*15}{1*2*3*4*5*6*7*8*9*10*11*12*13*14} =15$
$\frac{8!}{10!} = \frac{1}{9*10} = \frac{1}{90}$
$\frac{42!}{40!} = \frac{41*42}{1} =1722$
$\frac{16!}{14!3!} = \frac{1*2*3*4*5*6*7*8*9*10*11*12*13*14*15*16}{1*2*3*4*5*6*7*8*9*10*11*12*13*14*1*2*3} = \frac{15*16}{2*3} = \frac{5*8}{1} =40$