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If n is positive, which of the following is equal to 1 / {

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If n is positive, which of the following is equal to 1 / { [#permalink] New post 05 Nov 2008, 21:26
If n is positive, which of the following is equal to 1 / {√(n+1) -√n}?

A. 1
B. √(2n+1)
C. √(n+1) / √n
D. √(n+1) - √n
E. √(n+1) + √n
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Re: question--30 [#permalink] New post 05 Nov 2008, 22:01
just multiple numerator and denominator with sqrt(n+1)+sqrt(n)

E it is..
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Re: question--30 [#permalink] New post 06 Nov 2008, 00:33
freshina
cant that be smiplified to and hence be answer A ?

cheers
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Re: question--30 [#permalink] New post 06 Nov 2008, 06:35
fresinha12 wrote:
just multiple numerator and denominator with sqrt(n+1)+sqrt(n)

E it is..


agree with E, same approach
Re: question--30   [#permalink] 06 Nov 2008, 06:35
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If n is positive, which of the following is equal to 1 / {

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