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sud21: Master | Next Rank: 500 Posts; Posts: 344; Joined: Sat Nov 12, 2011 3:21 amFollowed by: 2 members; Thanked: 1 times

by sud21 » Tue Jan 31, 2012 2:58 am

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Source: Beat The GMAT — Problem Solving | Tue Jan 31, 2012 2:58 am

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Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members; Location: Milpitas, CA; Thanked: 1854 times; GMAT Score:770

by Anurag@Gurome » Tue Jan 31, 2012 5:36 am

sud21 wrote:

9^9 - 9^2 = 9^2(9^7 - 1)
Since 1 is negligible, so the above expression is equivalent to [spoiler]9^9[/spoiler] appr.

The correct answer is A.

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gmattest001: Junior | Next Rank: 30 Posts; Posts: 19; Joined: Tue Jan 31, 2012 1:41 amFollowed by: 1 member; Thanked: 1 times

by gmattest001 » Tue Jan 31, 2012 5:59 am

the closest value for 9^9-9^2 is

9^9 only
so A.

Nawneet

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