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Intern
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PS [#permalink]

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New post 24 Feb 2009, 12:27
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Which of the following is closest in value to 9^9 – 9^2 ?

A.9^9
B.9^8
C.9^7
D.9^6
E.9^5

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Director
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Re: PS [#permalink]

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New post 24 Feb 2009, 12:35
Its A-9^9

see ,
9^9-9^2=9^2((9^7) - 1)
~9^9
because 9^7 is too large compared to 1

janet1511 wrote:
Which of the following is closest in value to 9^9 – 9^2 ?

A.9^9
B.9^8
C.9^7
D.9^6
E.9^5


--
edited a small typo
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http://gmatclub.com/forum/math-polygons-87336.html
http://gmatclub.com/forum/competition-for-the-best-gmat-error-log-template-86232.html


Last edited by nitya34 on 25 Feb 2009, 23:09, edited 2 times in total.

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New post 24 Feb 2009, 14:15
Agree with A

subtracting 81 makes it closer to 9 ^ 9 among the answer choices

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Manager
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Re: PS [#permalink]

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New post 24 Feb 2009, 18:42
nitya34 wrote:
Its A-9^9

see ,
9^9-9^2=9^2((9^4.5) - 1)
~9^9
because 9^2 is too small compared to 9^9



Right approach but wrong equation

9^9-9^2 = 9^2(9^7 - 1)
~ 9^2*9^7 = 9^9

Kudos [?]: 14 [0], given: 0

Intern
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Re: PS [#permalink]

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New post 24 Feb 2009, 19:47
agreed with the answer

9^2(9^7-1)

approx = 9^9

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Director
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Re: PS [#permalink]

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New post 25 Feb 2009, 23:03
thanks
I corrected it :oops:
xyz21 wrote:
nitya34 wrote:
Its A-9^9

see ,
9^9-9^2=9^2((9^4.5) - 1)
~9^9
because 9^2 is too small compared to 9^9



Right approach but wrong equation

9^9-9^2 = 9^2(9^7 - 1)
~ 9^2*9^7 = 9^9

_________________

http://gmatclub.com/forum/math-polygons-87336.html
http://gmatclub.com/forum/competition-for-the-best-gmat-error-log-template-86232.html

Kudos [?]: 731 [0], given: 17

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Manager
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Re: PS [#permalink]

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New post 25 Feb 2009, 23:46
1
This post received
KUDOS
nitya34 wrote:
thanks
I corrected it :oops:
xyz21 wrote:
nitya34 wrote:
Its A-9^9

see ,
9^9-9^2=9^2((9^4.5) - 1)
~9^9
because 9^2 is too small compared to 9^9



Right approach but wrong equation

9^9-9^2 = 9^2(9^7 - 1)
~ 9^2*9^7 = 9^9


happens to all of us :)

Kudos [?]: 14 [1], given: 0

Re: PS   [#permalink] 25 Feb 2009, 23:46
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