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Source: — Problem Solving |
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by cramya » Wed Mar 11, 2009 7:29 pm
For GMAT know this:

a^2 - b^2 = (a+b) (a-b)

Being able to recognize this form may be the key to some problems.

a=1001 b=999

Again a=100 b=99

Then solve.

Regards,
CR
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