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GMAT Prep : 2 questions Q2

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WE 1: Investment Banking - 6yrs
GMAT Prep : 2 questions Q2  [#permalink]

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New post Updated on: 26 Jul 2009, 15:28
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GMAT Prep Question

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Originally posted by pm4553 on 26 Jul 2009, 11:46.
Last edited by nookway on 26 Jul 2009, 15:28, edited 1 time in total.
Removed .doc and added .jpg
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Re: GMAT Prep : 2 questions Q2  [#permalink]

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New post 26 Jul 2009, 12:34
you can put an image instead of a .doc, the question will appear....

the probability that a person who only guess become winner is (1/2)^n

we should have (1/2)^n < 1/1000 ==> 2^n > 1000 (I know that 2^10 = 1024 )

my answer is then 10

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Re: GMAT Prep : 2 questions Q2  [#permalink]

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New post 26 Jul 2009, 12:49
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In this question, they are talking about the concept of "relatively prime numbers"
See wiki

"Two integers are relatively prime if they share no common positive factors (divisors) except 1"

So for the question, if p is prime, every integers small than P, taken with p are relatively prime.
there are P-1 of them; from those we must take only the even ones.

so answer is (p-1)/2

--== 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.
Re: GMAT Prep : 2 questions Q2 &nbs [#permalink] 26 Jul 2009, 12:49
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