dtweah Master | Next Rank: 500 Posts View User Profile Posts: 487 Joined: Fri Mar 27, 2009 5:49 am Thanked: 36 times Marriage of Intergers by dtweah » Wed May 13, 2009 10:22 am There are how many pairs of positive integers (a,b) such that 1 <=a < b < 10? (a) 24 (b) 36 (c) 45 (d) 64 (e) 81 Top Quote
