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# PS: m 15 #10

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Manager
Joined: 05 Jan 2009
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PS: m 15 #10 [#permalink]

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20 Jun 2009, 12:34
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
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Re: PS: m 15 #10 [#permalink]

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23 Jun 2009, 20:14
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?
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Re: PS: m 15 #10 [#permalink]

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23 Jun 2009, 23:09
Here's a link to a similar discussion, so please post in this thread:
m15-73337.html

Please don't post duplicate threads. Post your questions in already existing threads for the questions that were discussed previously. You can find the list of all discussed questions here:
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Re: PS: m 15 #10   [#permalink] 23 Jun 2009, 23:09
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# PS: m 15 #10

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