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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
38% (02:17) correct
62%
(02:16)
wrong
based on 870
sessions
History
Date
Time
Result
Not Attempted Yet
Sequence S consists of 24 nonzero integers. If each term in S after the second is the product of the previous two terms, how many terms in S are negative?
(1) The third term in S is positive
(2) The fourth term in S is negative
(1) The third term in S is positive
(2) The fourth term in S is negative
The book claims this is one of the most diff questions GMAT can produce which I believe it is a joke....nevertheless got it wrong because I mis-interpreted the question. I am posting to see if more people will mis-interpret or if it is just me that is going *o*kers
07 Aug 2010, 13:17
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zisis
Answer cannot be B, it should be A.
Sequence S consists of 24 nonzero integers. If each term in S after the second is the product of the previous two terms, how many terms in S are negative?
(1) The third term in S is negative --> first and second terms must have opposite signs so we can hve following two scenarios:
-+--+--+--+-...
OR:
+--+--+--+--...
You can see that in both cases there is a repeated pattern of three terms in which 2 are negative and 1 positive (-+- or +--) so in both cases out of 24 terms 2/3 will be negative, so there will be 16 negative terms. Sufficient.
(2) The fourth term in S is positive --> either all terms are positive, so zero negatives or +--+... and not all terms are positive, so more than zero negatives. Not sufficient.
Answer: A.
Sequence S consists of 24 nonzero integers. If each term in S after the second is the product of the previous two terms, how many terms in S are negative?
(1) The third term in S is negative --> first and second terms must have opposite signs so we can hve following two scenarios:
-+--+--+--+-...
OR:
+--+--+--+--...
You can see that in both cases there is a repeated pattern of three terms in which 2 are negative and 1 positive (-+- or +--) so in both cases out of 24 terms 2/3 will be negative, so there will be 16 negative terms. Sufficient.
(2) The fourth term in S is positive --> either all terms are positive, so zero negatives or +--+... and not all terms are positive, so more than zero negatives. Not sufficient.
Answer: A.
If the OA is B then it should be:
Sequence S consists of 24 nonzero integers. If each term in S after the second is the product of the previous two terms, how many terms in S are negative?
(1) The third term in S is positive --> either all terms are positive, so zero negatives or +--... and not all terms are positive, so more than zero negatives. Not sufficient.
(2) The fourth term in S is negative --> again two cases:
--+--+--+...
OR
-+--+--+-...
The same here: in both cases there is a repeated pattern of three terms in which 2 are negative and 1 positive (--+ or -+-) so in both cases out of 24 terms 2/3 will be negative, so there will be 16 negative terms. Sufficient.
Answer: B.
Hope it's clear.
General Discussion
07 Aug 2010, 13:37
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the OA is def the one posted....double checked it.....
will let more people get involved and then post the OA explanation.....your post supports my view that this question is not phrased correclt (ie is open to misinterpetation).....
the bigger question is how can we make sure that the practise we get is up to the test's standard if massive companies like Kaplan cannt phrase their questions correctly....
will let more people get involved and then post the OA explanation.....your post supports my view that this question is not phrased correclt (ie is open to misinterpetation).....
the bigger question is how can we make sure that the practise we get is up to the test's standard if massive companies like Kaplan cannt phrase their questions correctly....
