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For a finite sequence of non zero numbers, the number of

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For a finite sequence of non zero numbers, the number of [#permalink] New post 02 Apr 2007, 00:41
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For a finite sequence of non zero numbers, the number of variations in signs is defined as the number of pairs of consecutive terms for which the product of the two consecutive terms is negative. What is the number of varations for the number in sequence 1,-3, 2,5,-4,-6?

a)1
b)2
c)3
d)4
e)5
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 [#permalink] New post 05 Apr 2007, 20:30
:( what is this question asking?
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[#permalink] New post 06 Apr 2007, 15:32
the question asks if you multiply each term in the series with the next term, how many such products will be negative ?

so let us multipy the first term byu the second term: 1 * -3 = -3 (negative)
2nd term * 3rd term = -3 * 2 = -6 (negative)

3rd term * 4th term = 2*5 = 10 (positive)
4th term * 5th term = 5* -4 = -20 (negative)
5th term * 6th term = -4*-6 = 24 (positive)

total = 3 negatives. therefore, C
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 [#permalink] New post 06 Apr 2007, 16:27
Thanks qxjmba!

Sometimes, it is difficult for me to understand the question stem. You people are wonderful! Always helping :-D
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Re: PS: finite consecutive terms [#permalink] New post 06 Apr 2007, 19:28
faifai0714 wrote:
For a finite sequence of non zero numbers, the number of variations in signs is defined as the number of pairs of consecutive terms for which the product of the two consecutive terms is negative. What is the number of varations for the number in sequence 1,-3, 2,5,-4,-6?

a)1
b)2
c)3
d)4
e)5


1 x -3 is negative
-3 x 2 is negative
2 x 5 is positive
5 x -4 is negative
-4 x -6 is positive

Answer c)
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 [#permalink] New post 10 Apr 2007, 04:41
Summer3 wrote:
Thanks qxjmba!

Sometimes, it is difficult for me to understand the question stem. You people are wonderful! Always helping :-D


I also didn't understand the question before...thanks!!!!
  [#permalink] 10 Apr 2007, 04:41
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For a finite sequence of non zero numbers, the number of

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