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# 10, -6, -5, -4, -2.5, -1, 0, 2.5, 4, 6, 7, 10} A number is

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Joined: 04 Aug 2008
Posts: 16
10, -6, -5, -4, -2.5, -1, 0, 2.5, 4, 6, 7, 10} A number is [#permalink]

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02 Nov 2008, 15:47
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{-10, -6, -5, -4, -2.5, -1, 0, 2.5, 4, 6, 7, 10}

A number is to be selected at random from the set above. What is the probability that the number selected will be solution of the equation (x-5)(x+10)(2x-5)=0?

A) 1/12

B) 1/6

C) 1/4

D) 1/3

E) 1/2

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Last edited by johnpeter on 02 Nov 2008, 16:31, edited 1 time in total.
Senior Manager
Joined: 04 Aug 2008
Posts: 369
Re: PS: GMAT PREP - Probability [#permalink]

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02 Nov 2008, 15:59
Assuming that u missed one number in the row the solution is C 1/4
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Intern
Joined: 04 Aug 2008
Posts: 16
Re: PS: GMAT PREP - Probability [#permalink]

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02 Nov 2008, 16:29
I choose the same answer but OA is different.
Senior Manager
Joined: 04 Aug 2008
Posts: 369
Re: PS: GMAT PREP - Probability [#permalink]

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02 Nov 2008, 17:18
Well I assumed umissed 5

since 5 is not listed

there are only two solutions
so its 2/12 1/6

B
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Manager
Joined: 09 Jul 2008
Posts: 109
Location: Dallas, TX
Schools: McCombs 2011
Re: PS: GMAT PREP - Probability [#permalink]

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02 Nov 2008, 18:26
Prob of selecting either 5 or 2.5 = 2/12 = 1/6
Intern
Joined: 03 Mar 2008
Posts: 44
Re: PS: GMAT PREP - Probability [#permalink]

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02 Nov 2008, 18:50
spiridon wrote:
Assuming that u missed one number in the row the solution is C 1/4

i don't think the question is missing a number by error
it is purposefully missing....there are 12 number and only 2 solutions provided.....(-10) and 2.5......5 is not provided in the set to choose from
hence the prob is 2/12 = 1/6
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Posts: 369
Re: PS: GMAT PREP - Probability [#permalink]

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02 Nov 2008, 21:38
kandyhot27 wrote:
spiridon wrote:
Assuming that u missed one number in the row the solution is C 1/4

i don't think the question is missing a number by error
it is purposefully missing....there are 12 number and only 2 solutions provided.....(-10) and 2.5......5 is not provided in the set to choose from
hence the prob is 2/12 = 1/6

Its not missing now, but initially before he edited the post there were only 11 numbers

--== 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!

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Re: PS: GMAT PREP - Probability   [#permalink] 02 Nov 2008, 21:38
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