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ddm: Master | Next Rank: 500 Posts; Posts: 162; Joined: Mon Jul 28, 2008 8:33 pm; Location: San Jose,CA; Thanked: 1 times

by ddm » Fri Sep 05, 2008 1:44 pm

help

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Source: Beat The GMAT — Problem Solving | Fri Sep 05, 2008 1:44 pm

pre-gmat: Master | Next Rank: 500 Posts; Posts: 105; Joined: Tue Jul 15, 2008 7:03 pm; Thanked: 5 times

by pre-gmat » Fri Sep 05, 2008 2:32 pm

need to select 2 children out of 10.

Its a combination problem

10C2 = 10!/ 2!*8! = 9*10/2= 45

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