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GMATPrep PS Clueless

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GMATPrep PS Clueless [#permalink] New post 22 Jan 2008, 20:41
00:00
A
B
C
D
E

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(N/A)

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0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Not able to search this one.
Apologies if published recently.
Work appreciated.
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Re: GMATPrep PS Clueless [#permalink] New post 22 Jan 2008, 22:23
Expert's post
C

{[1,-3],2,5,-4,6}
{1,[-3,2],5,-4,6}
{1,-3,2,[5,-4],6}
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Re: GMATPrep PS Clueless [#permalink] New post 22 Jan 2008, 22:29
walker wrote:
C

{[1,-3],2,5,-4,6}
{1,[-3,2],5,-4,6}
{1,-3,2,[5,-4],6}


Shouldn't it be 2,-3 -4,5 and 5,-6???
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Re: GMATPrep PS Clueless [#permalink] New post 22 Jan 2008, 22:36
Expert's post
I'm not sure but "...is defined as the number of pairs of consecutive terms of sequence..."
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Re: GMATPrep PS Clueless [#permalink] New post 23 Jan 2008, 16:49
walker wrote:
C

{[1,-3],2,5,-4,6}
{1,[-3,2],5,-4,6}
{1,-3,2,[5,-4],6}


OA is C . But I still don't understand this question.
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Re: GMATPrep PS Clueless [#permalink] New post 24 Jan 2008, 15:16
It talks about consecutive terms, so you must treat each number independently.

That is the reason why C is the answer!!!!
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Re: GMATPrep PS Clueless [#permalink] New post 24 Jan 2008, 19:35
We're dealing with consecutive pairs. So the sequence can be broken up like this:

{1,-3} {-3,2} {2,5} {5,-4} {-4,-6}

These are all of the consecutive pairs in the set. Now we just have to count how many pairs how 2 different signs involved because we're looking for pairs where the product is negative. Two positives or two negatives multiply out to be positive, so we need pairs that have one of each sign.

{1,-3} {-3,2} {5,-4} are the only ones. We have 3 pairs that fit.

Answer C
Re: GMATPrep PS Clueless   [#permalink] 24 Jan 2008, 19:35
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