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Re: M0218
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13 Feb 2018, 05:55
Bunuel wrote: karn99 wrote: I think this is a poorquality question and the explanation isn't clear enough, please elaborate. I'd suggest to read the whole discussion once again and ask specific question. P.S. The question is 100% correct and up to highest GMAT standards. It's not that easy though for novices. According to statement (2) the set S can contain {1,2,3} and isn't it sufficient to answer that all the elements of set S are NOT negative?



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13 Feb 2018, 05:58
karn99 wrote: Bunuel wrote: karn99 wrote: I think this is a poorquality question and the explanation isn't clear enough, please elaborate. I'd suggest to read the whole discussion once again and ask specific question. P.S. The question is 100% correct and up to highest GMAT standards. It's not that easy though for novices. According to statement (2) the set S can contain {1,2,3} and isn't it sufficient to answer that all the elements of set S are NOT negative? (2) The product of the smallest and largest integers in the set is a prime number. In set {1,2,3} the smallest number is 3 and the largest number is 2, their product is 6, which is not a prime number.
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13 Feb 2018, 09:34
As the questions says that the product of any three numbers is negative.
Lets say if one number is positive, +1, 1, 3, 9
As it says any three integers, we can take +1, 1, 3 prod = +3
The only way the product of "ANY" three integers are negative is only if all the numbers in the set are ve.
The answer should be A.



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13 Feb 2018, 09:45
dileeprk wrote: As the questions says that the product of any three numbers is negative.
Lets say if one number is positive, +1, 1, 3, 9
As it says any three integers, we can take +1, 1, 3 prod = +3
The only way the product of "ANY" three integers are negative is only if all the numbers in the set are ve.
The answer should be A. The answer should be and is C, not A. The product of any three integers in the set is negative means that no matter which three integers you pick from the set their product will turn out to be negative. Or in other words ALL sets of three integers you could pick will give negative product. The solution shows a set which gives a negative product while not having all negative terms: {negative, positive, positive}. The solution also mentions the following: If the set consists of more than 3 terms, then the set can only have negative numbers.
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Hi Bunuel! This question was in my Quant CAT today. I chose A. At the back of my mind, I was confused between A and C. But could not find a good an example. In the question it says that set S has more than 2 integers and according to statement 1, product of any 3 integers is negative. The explanation gives an example where S has 3 integers. Consider the following set {2,3,5,2,4} In this set, the product of any 3 integers will be negative if we take odd number of negative integers i.e 1 and 3. However, in a case where we choose {2,5,4} or similar 3 integers from set S, where there are even number of negative integers, the product is positive. Please can you help me identify my mistake. Thanks, V
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07 Jul 2018, 08:19
vaibhav1221 wrote: Hi Bunuel! This question was in my Quant CAT today. I chose A. At the back of my mind, I was confused between A and C. But could not find a good an example. In the question it says that set S has more than 2 integers and according to statement 1, product of any 3 integers is negative. The explanation gives an example where S has 3 integers. Consider the following set {2,3,5,2,4} In this set, the product of any 3 integers will be negative if we take odd number of negative integers i.e 1 and 3. However, in a case where we choose {2,5,4} or similar 3 integers from set S, where there are even number of negative integers, the product is positive. Please can you help me identify my mistake. Thanks, V {2,3,5,2,4} does not satisfy the condition that the product of ANY three integers in the set is negative: 2*(5)*(2) = 20 = positive. As explained in the solution, this could be true if: a. the set consists of only 3 terms, then the set could be either {negative, negative, negative} or {negative, positive, positive}. b. the set consists of more than 3 terms, then the set can only have negative numbers.
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18 May 2019, 15:14
Question is not of great quality, i can't imagine finding this question on GMAT exam.
1. Have to remember that primes are only positive  Kind of never tested quality of Primes. 2. Have to remember that one of the two cases in statement 1 was (,+,+) and use the fact that the product of the lowest and highest number is a prime, hence positive. Therefore case of (,+,+) is not possible. Its a stretch.
If it was given that the product of the lowest and greatest is positive then, we are getting closer to a real GMAT Q. I suspect that positive was changed to prime to make it more difficult, which just doesn't work somehow.



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22 Sep 2019, 23:54
I think this is a highquality question and I agree with explanation.







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