Marriage of Intergers

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dtweah: Master | Next Rank: 500 Posts; Posts: 487; Joined: Fri Mar 27, 2009 5:49 am; Thanked: 36 times

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

Source: Beat The GMAT — Problem Solving | Wed May 13, 2009 10:22 am

dtweah: Master | Next Rank: 500 Posts; Posts: 487; Joined: Fri Mar 27, 2009 5:49 am; Thanked: 36 times

by dtweah » Wed May 13, 2009 10:33 am

dtweah wrote: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

Please disregard this thread.

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