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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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10, -6, -5, -4, -2.5, -1, 0, 2.5, 4, 6, 7, 10} A number is [#permalink] New post 02 Nov 2008, 14:47
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C
D
E

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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

Last edited by johnpeter on 02 Nov 2008, 15:31, edited 1 time in total.
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Re: PS: GMAT PREP - Probability [#permalink] New post 02 Nov 2008, 14:59
Assuming that u missed one number in the row the solution is C 1/4
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Re: PS: GMAT PREP - Probability [#permalink] New post 02 Nov 2008, 15:29
I choose the same answer but OA is different.
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Re: PS: GMAT PREP - Probability [#permalink] New post 02 Nov 2008, 16:18
Well I assumed umissed 5

since 5 is not listed

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

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Re: PS: GMAT PREP - Probability [#permalink] New post 02 Nov 2008, 17:26
Prob of selecting either 5 or 2.5 = 2/12 = 1/6
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Re: PS: GMAT PREP - Probability [#permalink] New post 02 Nov 2008, 17:50
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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Re: PS: GMAT PREP - Probability [#permalink] New post 02 Nov 2008, 20:38
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
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Re: PS: GMAT PREP - Probability   [#permalink] 02 Nov 2008, 20:38
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