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Of the following integers, which is the closest

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Intern
Intern
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Joined: 08 Feb 2008
Posts: 25
Followers: 0

Kudos [?]: 4 [0], given: 4

Of the following integers, which is the closest [#permalink] New post 28 Feb 2010, 09:28
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

86% (01:06) correct 14% (00:04) wrong based on 7 sessions
How do you solve this one quick..

Of the following integers, which is the closest approximation to (\sqrt{2}+\sqrt{5})^2

a) 7
b) 10
c) 13
d) 15
e) 17
Senior Manager
Senior Manager
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Joined: 25 Jun 2009
Posts: 313
Followers: 2

Kudos [?]: 77 [0], given: 6

Re: GMAT Prep q#15 need help [#permalink] New post 28 Feb 2010, 10:25
divanshuj wrote:
How do you solve this one quick..

Of the following integers, which is the closest approximation to (\sqrt{2}+\sqrt{5})^2

a) 7
b) 10
c) 13
d) 15
e) 17

(\sqrt{2}+\sqrt{5})^2 = (\sqrt{2})^2 + (\sqrt{5} )^2 + 2 * \sqrt{2}\sqrt{5} = 2 + 5 + 2\sqrt{10} = 7 + 2 * 3.16 = 7+ 6.32 = 13. 32

Hence the answer is C


whats the OA?
Intern
Intern
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Joined: 08 Feb 2008
Posts: 25
Followers: 0

Kudos [?]: 4 [0], given: 4

Re: GMAT Prep q#15 need help [#permalink] New post 28 Feb 2010, 10:39
Yup C it is.

Thanks for that I took the wrong approach..this is much easier..
Re: GMAT Prep q#15 need help   [#permalink] 28 Feb 2010, 10:39
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Of the following integers, which is the closest

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