Hence 1 and 2 togethr are insufficientlet N+1=rootsquare (x+1) --> from 2 N is a prime number and x can be expressed as:x=(N+1)^2-1 jvaidya Intern Joined: 29 Mar 2010 Posts: 16 Schools: UCLA, USC WE 1: 3 Yr at leading SAAS company Followers: 0 Kudos [?]: