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metallicafan
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22 Dec 2010, 20:48
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S is a finite set of numbers. Does S contain more negative numbers than positive numbers?
(1) The product of all the numbers in S is -1,200.
(2) There are 6 numbers in S.
(1) The product of all the numbers in S is -1,200.
(2) There are 6 numbers in S.
22 Dec 2010, 22:00
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metallicafan
Hi,
in general, there are two ways to attack DS questions: picking numbers and using concepts. Almost all questions can be done both ways.
If we want to attack this one using concepts:
(1) negative product means we have an odd number of negative terms and an unknown number of positive terms. So, no clue which we have more of - insufficient.
(2) no clue how many are negative or positive - insufficient.
Together: from (1), we know we must have 1, 3 or 5 negative terms. So, there could be:
1 negative, 5 positive
3 negative, 3 positive
5 negative, 1 positive
Are there more negatives than positives? It's still uncertain - choose (E).
General Discussion
metallicafan
Retired Moderator
Joined: 04 Oct 2009
Last visit: 26 Aug 2020
Posts: 759
Own Kudos:
Given Kudos: 109
Status:2000 posts! I don't know whether I should feel great or sad about it! LOL
Location: Peru
Concentration: Finance, SMEs, Developing countries, Public sector and non profit organizations
Schools:Harvard, Stanford, Wharton, MIT & HKS (Government)
GPA: 4.0
WE 1: Economic research
WE 2: Banking
WE 3: Government: Foreign Trade and SMEs
22 Dec 2010, 22:27
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Thanks skovinsky!
In your opinion, which way is better?
IMO, using concepts and algebraic solutions are better because when you pick numbers, there could be the possibility that you are not picking the right numbers, or maybe you are forgetting to review an important scenario.
What do you think?
In your opinion, which way is better?
IMO, using concepts and algebraic solutions are better because when you pick numbers, there could be the possibility that you are not picking the right numbers, or maybe you are forgetting to review an important scenario.
What do you think?
