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C The larger the numerator and denominator are (and the discrepancy between the 2 remains constant) the closer that fraction is to 1. So: 1/2 is smaller than 49/50 and 49/50 is smaller than 99/100.

I got to C somewhat indirectly. I said that we need the highest numerator and lowest denominator. Then I agrued that 1/2 is less than 2/3 is less than 3/4 and therefore C. Your method is very logical.
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My friend, If you post Gmatclub Challenge questions, be kind and state the bloody source. You should be posting them in the relevant folder, in the first place. You can't just dump a quarter of a Challenge without citing the source. One could understand if the questions were not Challenge or GMATPrep questions. If you don't understand how much trouble it can cause, I am happy to explain it - just let me know. sorry for offtop.

Re: Which expression is the greatest (m07q16) [#permalink]

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01 Apr 2010, 06:38

xALIx wrote:

Which expression is the greatest? (A) \(\frac{1876452}{1876455}\) (B) \(\frac{1883456}{1883459}\) (C) \(\frac{1883491}{1883494}\) (D) \(\frac{1883446}{1883449}\) (E) \(\frac{1883453}{1883456}\)

Re: Which expression is the greatest (m07q16) [#permalink]

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07 Apr 2010, 08:17

I think this is a Gmat Challenge Question. A is out. B - E: of the format n/(n+3), n (183491) is greatest in C and it is the correct answer.
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KUDOS me if you feel my contribution has helped you.

Re: Which expression is the greatest (m07q16) [#permalink]

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06 Apr 2011, 00:50

Ans C - went with the assumption that greater Numerator and greater Denominator would provide the largest fraction .

And finally found it to be true! Thanks to You Guys for the explanations.

Also I have a Question in case we have a Numerator greater than the Denominator like - 21/20, 32/33,/45/46.. Is It true that the smallest numericals of Numerator and Denominator would have the greatest fraction ???

Re: Which expression is the greatest (m07q16) [#permalink]

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28 Jun 2011, 21:24

Suppose the question were to be reframed and we were asked to find the smallest number instead. It would be the number with the smallest numerator right? i.e. choice A?

C The larger the numerator and denominator are (and the discrepancy between the 2 remains constant) the closer that fraction is to 1. So: 1/2 is smaller than 49/50 and 49/50 is smaller than 99/100.

Thats the same logic I'd employ! This was one of the easier ones though ; Thanks for the explanation!!