Woozler Senior | Next Rank: 100 Posts View User Profile Posts: 43 Joined: Sat Nov 06, 2010 12:04 pm GMAT DS by Woozler » Mon Dec 13, 2010 9:08 am If n is a positive integer and r is the remainder when (n-1)(n+1) is divided by 24, what is the value of r? (1) 2 is not a factor of n (2) 3 is not a factor of n Top Quote
