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# sequence gmat prep question.

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Intern
Joined: 26 Oct 2009
Posts: 2
sequence gmat prep question. [#permalink]

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28 Oct 2009, 21:57
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Q. For a finite sequence of nonzero numbers, the number of variations in sign is defined as the number of pairs of consecutive terms of the sequence for which the product of the two consecutive terms is negative. What is the number of variations in sign for the sequence 1,-3,2,5,-4,-6.

a. one
b. Two
c. Three
d. Four
e. Five
Senior Manager
Joined: 18 Aug 2009
Posts: 299
Re: sequence gmat prep question. [#permalink]

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28 Oct 2009, 22:02
C

1, -3
-3, 2
5, -4

three pairs of consecutive sequence terms where product comes to be -ive
Intern
Joined: 26 Oct 2009
Posts: 2
Re: sequence gmat prep question. [#permalink]

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28 Oct 2009, 22:05
thanks, i was having trouble understanding the question.
Senior Manager
Joined: 18 Aug 2009
Posts: 299
Re: sequence gmat prep question. [#permalink]

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28 Oct 2009, 22:17
np.. 1-2 hrs of wordy math and I'm not able to read any meaning into these
Manager
Joined: 15 Sep 2009
Posts: 134
Re: sequence gmat prep question. [#permalink]

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29 Oct 2009, 04:44
I will choose option 3.

1 * -3
-3 * 2
5* -4
Senior Manager
Joined: 16 Jul 2009
Posts: 253
Re: sequence gmat prep question. [#permalink]

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31 Oct 2009, 11:57
IMO C, the question needs to be read well before arriving at the right option..
Re: sequence gmat prep question.   [#permalink] 31 Oct 2009, 11:57
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# sequence gmat prep question.

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