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36) For a finite set of nonzero numbers, the number of varia

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by varun289 » Sun May 05, 2013 7:57 pm
36) For a finite set 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 consecutive terms is negative. What is the number of variations in sign for the sequence 1, -3, 2, 5, -4, -6?
a. 1
b. 2
c. 3
d. 4
e. 5
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Source: — Data Sufficiency |
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by hemant_rajput » Sun May 05, 2013 8:33 pm
varun289 wrote:36) For a finite set 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 consecutive terms is negative. What is the number of variations in sign for the sequence 1, -3, 2, 5, -4, -6?
a. 1
b. 2
c. 3
d. 4
e. 5
IMO C

only 3 pair are there sequence which meets the criteria of being consecutive and their product is negative.

1 , -3
-3 , 2
5 , -4
I'm no expert, just trying to work on my skills. If I've made any mistakes please bear with me.
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by Blue_Skies » Tue May 07, 2013 11:50 am
Straighforward. Count the pairs as per the definition. Ans C
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