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# GMATPrep PS Clueless

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Director
Joined: 08 Jun 2007
Posts: 573

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22 Jan 2008, 21:41
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This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Not able to search this one.
Apologies if published recently.
Work appreciated.
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CEO
Joined: 17 Nov 2007
Posts: 3584
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40

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22 Jan 2008, 23:23
C

{[1,-3],2,5,-4,6}
{1,[-3,2],5,-4,6}
{1,-3,2,[5,-4],6}
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CEO
Joined: 29 Mar 2007
Posts: 2559

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22 Jan 2008, 23:29
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???
CEO
Joined: 17 Nov 2007
Posts: 3584
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40

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22 Jan 2008, 23:36
I'm not sure but "...is defined as the number of pairs of consecutive terms of sequence..."
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Director
Joined: 08 Jun 2007
Posts: 573

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23 Jan 2008, 17:49
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.
Senior Manager
Joined: 22 Sep 2005
Posts: 276

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24 Jan 2008, 16:16
It talks about consecutive terms, so you must treat each number independently.

That is the reason why C is the answer!!!!
Director
Joined: 12 Jul 2007
Posts: 858

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24 Jan 2008, 20:35
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.

Re: GMATPrep PS Clueless   [#permalink] 24 Jan 2008, 20:35
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