GMATPrep PS Clueless

Question

Not able to search this one.
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Work appreciated.

walker · Answer

C

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

GMATBLACKBELT · Answer

Shouldn't it be 2,-3 -4,5 and 5,-6???

walker · Answer

I'm not sure but " ...is defined as the number of  pairs of consecutive terms  of sequence... "

ashkrs · Answer

OA is C . But I still don't understand this question.

netcaesar · Answer

It talks about consecutive terms, so you must treat each number independently.

That is the reason why C is the answer!!!!

eschn3am · Answer

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

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