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# what is the strategy to be used?

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Manager
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what is the strategy to be used? [#permalink]  09 May 2010, 17:55
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5% (low)

Question Stats:

100% (01:51) correct 0% (00:00) wrong based on 1 sessions
Hi,

I'm sure there is a strategy to use in order to solve the question...I dont think that the GMAT expects me to do the calculation!!
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Math Expert
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Re: what is the strategy to be used? [#permalink]  09 May 2010, 18:05
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Hi,

I'm sure there is a strategy to use in order to solve the question...I dont think that the GMAT expects me to do the calculation!!

You should apply the following formula: x^2-y^2=(x-y)(x+y)

\frac{1001^2-999^2}{101^2-99^2}=\frac{(1001-999)(1001+999)}{(101-99)(101+99)}=\frac{2*2000}{2*200}=10

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Re: what is the strategy to be used? [#permalink]  12 Dec 2010, 00:09
damn. So simple. Thanks m8.
Re: what is the strategy to be used?   [#permalink] 12 Dec 2010, 00:09
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# what is the strategy to be used?

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