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Which of the following represents the greatest value?

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Which of the following represents the greatest value? [#permalink] New post 05 Jul 2011, 11:15
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Question Stats:

58% (02:34) correct 42% (02:25) wrong based on 72 sessions
Which of the following represents the greatest value?

A) \sqrt{2} / \sqrt{3} + \sqrt{3}/\sqrt{4}+\sqrt{4}/\sqrt{5}+\sqrt{5}/\sqrt{6}

B) 2/3 + 3/4 + 4/5 + 5/6

C) 2^2/3^2 + 3^2/4^2 + 4^2/5^2 + 5^2/6^2

D) 1-1/3 + 4/5 - 3/4

E) 1-3/4 + 4/5 + 1/3
[Reveal] Spoiler: OA

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Last edited by Bunuel on 08 Jan 2013, 02:30, edited 1 time in total.
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Re: 2-mins challenge [#permalink] New post 05 Jul 2011, 11:37
jamifahad wrote:
Solve this under 2 mins.

Which of the following represents the greatest value?

A) \sqrt{2} / \sqrt{3} + \sqrt{3}/\sqrt{4}+\sqrt{4}/\sqrt{5}+\sqrt{5}/\sqrt{6}

B) 2/3 + 3/4 + 4/5 + 5/6

C) 2^2/3^2 + 3^2/4^2 + 4^2/5^2 + 5^2/6^2

D) 1-1/3 + 4/5 - 3/4

E) 1-3/4 + 4/5 + 1/3


I could make direct comparison between A, B and C and locked on A because the difference between numerator & denominator of individual term in A are smaller than that of B and C.

D: 1-0.3+0.8-0.75<1
E: 1-0.75+0.8+0.3= 1.5 approx

A: Every term is definitely more than 0.5 because the denominator was less than twice. Thus
A> 0.5+0.5+0.5+0.5=2

Ans: "A"
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Re: 2-mins challenge [#permalink] New post 05 Jul 2011, 22:02
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jamifahad wrote:
Solve this under 2 mins.

Which of the following represents the greatest value?

A) \sqrt{2} / \sqrt{3} + \sqrt{3}/\sqrt{4}+\sqrt{4}/\sqrt{5}+\sqrt{5}/\sqrt{6}

B) 2/3 + 3/4 + 4/5 + 5/6

C) 2^2/3^2 + 3^2/4^2 + 4^2/5^2 + 5^2/6^2

D) 1-1/3 + 4/5 - 3/4

E) 1-3/4 + 4/5 + 1/3


I think for most people the only confusing options will be A and B.

You can compare fractions very easily by making either their denominator or numerator same.

Say I want to compare \sqrt{2} / \sqrt{3} with 2/3.
I just multiply and divide \sqrt{2} / \sqrt{3} by \sqrt{2} to get 2/\sqrt{6}.
Since \sqrt{6} is less than 3, 2/\sqrt{6} (i.e. \sqrt{2} / \sqrt{3}) is greater than 2/3.
Similarly, all terms of option A will be greater than all corresponding terms of option B.

Perfect example of how complicated looking questions are also based on very fundamental concepts.
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Re: 2-mins challenge [#permalink] New post 06 Jul 2011, 09:14
2/3 < 1, so sq rt(2/3) > 1.
D and E are less by some calculations.
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Re: 2-mins challenge [#permalink] New post 06 Jul 2011, 14:34
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A
eliminated D and E as there are negatives
2^2/3^2 < 2/3 < [2][/2]
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Re: 2-mins challenge [#permalink] New post 07 Jan 2013, 11:49
out of a/b/c a is surely greatest because diff between numerator and denominator of each term is least in A.
d and e can be calculated to see that d is less than 1 and e is less than 2
A is greater than 2 since each term in A is greater than 0.5.
Hence answer - A
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Re: Which of the following represents the greatest value? [#permalink] New post 15 Jan 2014, 10:06
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Re: Which of the following represents the greatest value?   [#permalink] 15 Jan 2014, 10:06
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