Question

(n-1)!/n+2)!
Упростить

Answer 1

   1*2*3.........*n-1
= ------------------------------------ = 1/(n*n+1*n+2)
   1*2*3...........n-1*n*n+1*n+2

Answer 2

Сократим и получим 1/(n*(n+1)*(n+2)) 
--------------------------------------------------------------