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Exponents!

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Manager
Manager
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Affiliations: CFA L3 Candidate, Grad w/ Highest Honors
Joined: 03 Nov 2007
Posts: 129
Location: USA
Schools: Chicago Booth R2 (WL), Wharton R2 w/ int, Kellogg R2 w/ int
WE 1: Global Operations (Futures & Portfolio Financing) - Hedge Fund ($10bn+ Multi-Strat)
WE 2: Investment Analyst (Credit strategies) - Fund of Hedge Fund ($10bn+ Multi-Strat)
Exponents! [#permalink]

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New post 04 Aug 2009, 20:37
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[1001^2 - 999^2] / [101^2 - 99^2]

10
20
40
80
100

I was able to make a intelligent guess and got lucky but I KNOW there is a trick to this. Anyone want to take a stab at it?

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
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SVP
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Joined: 30 Apr 2008
Posts: 1841
Location: Oklahoma City
Schools: Hard Knocks
Re: Exponents! [#permalink]

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New post 04 Aug 2009, 20:54
2
x^2 - y^2 = (x - y)(x + y) so...

\(\frac{(1001 - 999)(1001 + 999)}{(101-99)(101+99)}\)

now do the simple math

2*2000 / 2*200 = 4000/400 = 10

robertrdzak wrote:
[1001^2 - 999^2] / [101^2 - 99^2]

10
20
40
80
100

I was able to make a intelligent guess and got lucky but I KNOW there is a trick to this. Anyone want to take a stab at it?

_________________

------------------------------------
J Allen Morris
**I'm pretty sure I'm right, but then again, I'm just a guy with his head up his a$$.

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Joined: 29 Jul 2009
Posts: 14
Schools: Sauder,Cornell,McGill
Re: Exponents! [#permalink]

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New post 04 Aug 2009, 22:47
Thanks - you helped me refresh a long forgotten yet simple rule :)
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~~RookieR~~

Out beyond ideas of wrongdoing and rightdoing, there is a field. I will meet you there

Senior Manager
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Joined: 17 Jul 2009
Posts: 259
Concentration: Nonprofit, Strategy
GPA: 3.42
WE: Engineering (Computer Hardware)
Re: Exponents! [#permalink]

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New post 05 Aug 2009, 13:12
factorization works wonders!! =)
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Joined: 18 Jul 2009
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Location: India
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Re: Exponents! [#permalink]

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New post 05 Aug 2009, 20:54
X^2 - y^2 = (x - y)(x + y) .....

[1001+999][1001-999] / [101+99][101-99]

2*2000 / 2*200 = 4000/400 = 10

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________

Bhushan S.
If you like my post....Consider it for Kudos :-D

Re: Exponents!   [#permalink] 05 Aug 2009, 20:54
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