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GMAT Prep : 2 questions Q2

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Director
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Joined: 27 Jun 2008
Posts: 541

Kudos [?]: 68 [0], given: 92

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

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New post 26 Jul 2009, 11:46
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Last edited by nookway on 26 Jul 2009, 15:28, edited 1 time in total.
Removed .doc and added .jpg

Kudos [?]: 68 [0], given: 92

Current Student
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Joined: 20 Jul 2009
Posts: 191

Kudos [?]: 37 [0], given: 6

Location: Africa/Europe
Schools: Kellogg; Ross ($$); Tuck
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

B

Kudos [?]: 37 [0], given: 6

Current Student
avatar
Affiliations: ?
Joined: 20 Jul 2009
Posts: 191

Kudos [?]: 37 [0], given: 6

Location: Africa/Europe
Schools: Kellogg; Ross ($$); Tuck
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

Kudos [?]: 37 [0], given: 6

Re: GMAT Prep : 2 questions Q2   [#permalink] 26 Jul 2009, 12:49
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GMAT Prep : 2 questions Q2

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