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17 Oct 2018, 01:34
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TomB
One of the major error I did in this problem was to arrange the terms in ascending order since it was talking about consecutive terms.
For people who did a similar mistake Ron from MGMAT says:
RON:you're asking the wrong question. a SEQUENCE, by default, is IN ORDER. you cannot change the order of a sequence unless you are explicitly instructed to do so by the problem.
Rest this problem is a cake walk.
Press Kudos if it helps!!
20 Feb 2020, 13:36
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Bunuel
Hi Bunuel
Why can't the answer be 2 instead of 3?
Since we have list of pairs
1*(-3)=-3=negative; -----> 1st pair doesn't have a sign change because the sign change is asked for consecutive pairs and not integers I felt
-3*2=-6=negative;
2*5=10=positive;
5*(-4)=-20=negative;
(-4)*(-6)=24=positive.
However per pair the sign change is then happening only twice.
Please clarify
21 Feb 2020, 00:38
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Anurag06
Not sure I understand what you are trying to say there...
The number of variations in the 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.
-3 and 2 are consecutive terms in the sequence, their product is negative, so this pair should also count.
