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Page 191

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karthiksuri
 Post subject: Page 191
 Post Posted: Thu Mar 18, 2010 12:28 am 
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Students


Posts: 1
Hi,

I have a word translations book from mgmat, guide 4. In page 191, the medical researcher problem, the answer given is 1/7, the result of sum of two 1/14 probabilities, I was wondering if the 2nd probability calculated is an error, instead of 1/14 shouldn't it be 13/14*1/13 ?

thanks.
karthik.
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itzdeepika
 Post subject: Re: Page 191
 Post Posted: Sat Mar 27, 2010 7:17 pm 
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Students


Posts: 7
hi karthik,
Could you please post the question as well.

Regards,
Deepika
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tim
 Post subject: Re: Page 191
 Post Posted: Tue Apr 06, 2010 6:41 pm 
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ManhattanGMAT Staff


Posts: 1779
Location: Southwest Airlines, seat 21C
13/14*1/13 IS the same thing as 1/14. :) You've calculated the answer a different way than the book did, but the fact that the answers are the same shows you that there are two equally valid ways to get to this answer.

_________________
Tim Sanders
Manhattan GMAT Instructor
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