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Are all of the numbers in a certain list of 15 numbers

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Are all of the numbers in a certain list of 15 numbers [#permalink] New post 15 Jun 2008, 10:31
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Are all of the numbers in a certain list of 15 numbers equal?

1) The sum of all the numbers in the list is 60
2) the sum of any 3 numbers in the list is 12
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Re: DS: sum [#permalink] New post 16 Jun 2008, 07:41
not sure about this one, went with B
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Re: DS: sum [#permalink] New post 16 Jun 2008, 08:04
1) The sum of all the numbers in the list is 60
2) the sum of any 3 numbers in the list is 12

1) Insuff... since you can not make out numbers in the list are equal
15*4 = 60 and 2*10 3*10 + ... = 60.

2)
4*15 = 60.

Answer : B
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Re: DS: sum [#permalink] New post 17 Jun 2008, 15:52
Going with B as well. What's the OA?
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Re: DS: sum [#permalink] New post 17 Jun 2008, 16:11
rajesh04 wrote:
1) The sum of all the numbers in the list is 60
2) the sum of any 3 numbers in the list is 12

1) Insuff... since you can not make out numbers in the list are equal
15*4 = 60 and 2*10 3*10 + ... = 60.

2)
4*15 = 60.

Answer : B


If you are using 4*15=60, does this mean you are taking into account that A is used to double check? The question doesn't tell you the sum if you are examining the set alone.

A is insufficient.

B means each number is 4 (the sum of any 3 is 12, or 12/3 = 4), which answers the question.
Re: DS: sum   [#permalink] 17 Jun 2008, 16:11
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