ketkoag Legendary Member View User Profile Posts: 876 Joined: Thu Apr 10, 2008 8:14 am Thanked: 13 times series by ketkoag » Wed Jun 10, 2009 2:04 am a1=2, a2=3, a3=a1*a2, a4=a1*a2*a3*, ... If an=t (n>=3), a(n+2)=? [spoiler]IMO : t/36.. but OA is diff. [/spoiler]please lemme know if i am missing something.. Top Quote