Reducing factorials

This topic has expert replies
Master | Next Rank: 500 Posts
Posts: 226
Joined: Sun Aug 09, 2009 4:34 am

Reducing factorials

by ern5231 » Wed Oct 07, 2009 8:18 pm
This is just a random factorial question that i picked from somewhere. This expression can be reduced to k!(1+n) but the asnwer given is different. Is it possible to derive n(K-1)! from the question?

Known n> K, What is K! + (NK) (K-1)! =?

Ans : n(K-1)!
Source: — Problem Solving |