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Exponents!

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Manager
Manager
User avatar
Affiliations: CFA L3 Candidate, Grad w/ Highest Honors
Joined: 03 Nov 2007
Posts: 131

Kudos [?]: 147 [0], given: 9

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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[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?

Kudos [?]: 147 [0], given: 9

2 KUDOS received
SVP
SVP
User avatar
Joined: 30 Apr 2008
Posts: 1863

Kudos [?]: 627 [2], given: 32

Location: Oklahoma City
Schools: Hard Knocks
Re: Exponents! [#permalink]

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New post 04 Aug 2009, 19:54
2
This post received
KUDOS
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$$.

GMAT Club Premium Membership - big benefits and savings

Kudos [?]: 627 [2], given: 32

Intern
Intern
avatar
Joined: 29 Jul 2009
Posts: 15

Kudos [?]: 19 [0], given: 4

Schools: Sauder,Cornell,McGill
Re: Exponents! [#permalink]

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New post 04 Aug 2009, 21:47
Thanks - you helped me refresh a long forgotten yet simple rule :)
_________________

~~RookieR~~

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

Kudos [?]: 19 [0], given: 4

Senior Manager
Senior Manager
avatar
Joined: 17 Jul 2009
Posts: 285

Kudos [?]: 44 [0], given: 9

Concentration: Nonprofit, Strategy
GPA: 3.42
WE: Engineering (Computer Hardware)
Re: Exponents! [#permalink]

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New post 05 Aug 2009, 12:12
factorization works wonders!! =)

Kudos [?]: 44 [0], given: 9

Manager
Manager
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Joined: 18 Jul 2009
Posts: 167

Kudos [?]: 116 [0], given: 37

Location: India
Schools: South Asian B-schools
Re: Exponents! [#permalink]

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New post 05 Aug 2009, 19:54
X^2 - y^2 = (x - y)(x + y) .....

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

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

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

Kudos [?]: 116 [0], given: 37

Re: Exponents!   [#permalink] 05 Aug 2009, 19:54
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Exponents!

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