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# PS: m 15 #10

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Manager
Joined: 05 Jan 2009
Posts: 82
Followers: 1

Kudos [?]: 86 [0], given: 2

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20 Jun 2009, 11:34
Set consists of all prime integers less than 10. If two numbers are chosen form set at random, what is the probability that the product of these numbers will be greater than the product of the numbers which were not chosen?
Manager
Joined: 30 May 2009
Posts: 218
Followers: 5

Kudos [?]: 115 [0], given: 0

Re: PS: m 15 #10 [#permalink]

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23 Jun 2009, 19:14
Set = {2,3,5,7}

Number of ways to chose 2 numbers = 4C2 = 6
Number of ways to chose such that product is greater than product of remaining = 3 ways ((3,5), (3,7), (5,7))

Hence answer = 3/6 = 1/2

What is the OA?
CIO
Joined: 02 Oct 2007
Posts: 1218
Followers: 94

Kudos [?]: 905 [0], given: 334

Re: PS: m 15 #10 [#permalink]

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23 Jun 2009, 22:09
m15-73337.html

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Re: PS: m 15 #10   [#permalink] 23 Jun 2009, 22:09
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# PS: m 15 #10

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