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sequence gmat prep question.

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Intern
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sequence gmat prep question. [#permalink] New post 28 Oct 2009, 20:57
00:00
A
B
C
D
E

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(N/A)

Question Stats:

75% (01:12) correct 25% (01:15) wrong based on 4 sessions
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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
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Re: sequence gmat prep question. [#permalink] New post 28 Oct 2009, 21:02
C

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

three pairs of consecutive sequence terms where product comes to be -ive
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Re: sequence gmat prep question. [#permalink] New post 28 Oct 2009, 21:05
thanks, i was having trouble understanding the question.
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Re: sequence gmat prep question. [#permalink] New post 28 Oct 2009, 21:17
np.. 1-2 hrs of wordy math and I'm not able to read any meaning into these :lol:
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Re: sequence gmat prep question. [#permalink] New post 29 Oct 2009, 03:44
I will choose option 3.

1 * -3
-3 * 2
5* -4
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Re: sequence gmat prep question. [#permalink] New post 31 Oct 2009, 10:57
IMO C, the question needs to be read well before arriving at the right option..
Re: sequence gmat prep question.   [#permalink] 31 Oct 2009, 10:57
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