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desiguy
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 Posted: Mon Jul 21, 2008 2:20 pm Post subject: connection between 12 and 21 ? |
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whats the connection between 12 and 21 ?
ans: 1/3
how ? |
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parallel_chase
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| Posted: Mon Jul 21, 2008 3:28 pm Post subject: Re: connection between 12 and 21 ? |
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| desiguy wrote: | whats the connection between 12 and 21 ?
ans: 1/3
how ? |
Only connection that I know is both are divisible by 3 and both are 9 integers apart from each other on the number line.
Also
12/21 = 4/7 if you subtract 3 from numerator and denominator you will get 1/3
OK now seriously this cant be a question. There is something definitely wrong with it. |
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beeparoo
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| Posted: Wed Jul 23, 2008 1:16 pm Post subject: Re: connection between 12 and 21 ? |
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| parallel_chase wrote: |
OK now seriously this cant be a question. There is something definitely wrong with it. |
That's cause the FULL question is not typed out. The "connection" is actually a defined in the problem as something like "the lowest common multiple of both integers divided by their products". I know this question because it's been posted here so many times.
Seriously? Have the decency to write out the full question if you want help with your problems. |
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Stuart Kovinsky
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| Posted: Wed Jul 23, 2008 1:41 pm Post subject: |
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Yes, most of the question is in fact missing.
This is a "wacky definition" question, in which the term "connection" is defined solely for the purpose of this particular question. Without the definition, there is no possible way to answer the question.
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gmatutor
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| Posted: Wed Jul 23, 2008 2:12 pm Post subject: |
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| Is there such a question that exists on the actual GMAT or in OG material? If so I would be interested in reading it. I have seen question that ask about Fermat primes, but that is not a made up concept. |
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Ian Stewart
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| Posted: Thu Jul 24, 2008 8:35 am Post subject: |
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| gmatutor wrote: | | Is there such a question that exists on the actual GMAT or in OG material? If so I would be interested in reading it. I have seen question that ask about Fermat primes, but that is not a made up concept. |
The 'connection' is actually not a made up concept either; it's just not very useful, since it's always equal to the reciprocal of the GCD (because the LCM*GCD = Product). The GMAT question that immediately comes to mind in this vein is the question about the 'length' of an integer, and if I recall correctly, that question is from GMATPrep- I might be wrong about that. The length, again, is a real math term,- it's interesting to see questions about Fermat Primes, lengths of integers, the golden ratio, etc- the questions are definitely prepared by mathematicians.
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