shibal Master | Next Rank: 500 Posts View User Profile Posts: 345 Joined: Wed Mar 18, 2009 6:53 pm Location: Sao Paulo-Brazil Thanked: 12 times GMAT Score:660 solve factors by shibal » Fri May 01, 2009 10:16 am what is (2^2-1)(2^2+1)(2^4+1)(2^8+1) equal to? Top Quote