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Lograthims

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by Karthik12 » Wed Jul 23, 2008 8:57 pm
GIven that log 3=0.477, log 7=0.845, log 2=0.301. Find the number of digits in Y if Y=252^10(the power of 10).
1. 12
2. 25
3. 24
4. 30
5. cannot be determined
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by sudhir3127 » Wed Jul 23, 2008 9:44 pm
IMO 24.
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by Karthik12 » Wed Jul 23, 2008 10:40 pm
Pls anyone give the answer with sufficient explaination
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by sudhir3127 » Wed Jul 23, 2008 10:51 pm
Y = 252^10

applying log on both the sides

Log Y= 10 log 252

10 log( 2*2*3*3*7)
log m*n = Log m+ log n

hence its 10 (0.603+0.954+.0854)
= 24.02

whats the OA?
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by pepeprepa » Thu Jul 24, 2008 12:19 am
Y = 252^10

I trust calculations of sudhir:
Log Y = 24.02

We know that: log 10=1
So we also know
log 10^2=2
log 10^24=24 which is more or less 24.02
log Y=24=log 10^24
Y=10^24
In 10^24 we have 24+1 digits so 25
Y has 25 digits

Tell me if my demonstration has weaknesses, I do not master log.
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by sudhir3127 » Thu Jul 24, 2008 12:28 am
ya pepeprepa ur right...

it would be 10^24 .i thought it would have 24 digits...

it will have n+1 digits... hence 25..

can someone confirm the OA.
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by gmatutor » Thu Jul 24, 2008 1:09 am
Studying logs may be useful for your MBA course but is not tested on the GMAT, nor in all the official material I have, dating back to 1976, has it ever been tested on the GMAT.

On the mba.com website it mentions that the most important thing a student can do when studying is to focus on those areas that will help them the most. I believe that advice is sound. This is unlikely to help you increase your GMAT score.
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by pepeprepa » Thu Jul 24, 2008 1:13 am
Ok I did not know logarithms were no on the program of the gmat.

Karthik12 where did you find this question?
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by Karthik12 » Thu Jul 24, 2008 2:49 am
thank u Guyz
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by gmattakers » Thu Oct 30, 2008 3:22 pm
I choose C, too
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by arora007 » Fri Aug 06, 2010 12:38 pm
Can an expert please comment whether Logarithms are tested on the GMAT or not.
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by GMATGuruNY » Fri Aug 06, 2010 12:50 pm
arora007 wrote:Can an expert please comment whether Logarithms are tested on the GMAT or not.
Logarithms are not tested on the GMAT.
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by Stuart@KaplanGMAT » Fri Aug 06, 2010 3:27 pm
arora007 wrote:Can an expert please comment whether Logarithms are tested on the GMAT or not.
100% no!
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by arora007 » Fri Aug 06, 2010 7:30 pm
Thanks a lot Guru , Stuart... I am relieved. :)
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