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lilu: Master | Next Rank: 500 Posts; Posts: 148; Joined: Wed Dec 10, 2008 5:13 pm; Location: SF, CA; Thanked: 12 times

by lilu » Tue Apr 21, 2009 10:24 am

OA is D
I think this is not a difficult question, but I got it wrong and would like to see how others would solve it.

Thank you

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Source: Beat The GMAT — Problem Solving | Tue Apr 21, 2009 10:24 am

pakaskwa: Master | Next Rank: 500 Posts; Posts: 107; Joined: Wed Mar 04, 2009 4:39 am; Location: Vancouver; Thanked: 9 times; GMAT Score:750

by pakaskwa » Tue Apr 21, 2009 10:49 am

From question stem we can get:
g(2)=(2^2+2)/(2-1)=6 --> 1/g(2)=1/6
g(x)=(x^2+2)/(x-1) --> 1/g(x)=(x-1) /(x^2+2)

[1/g(2)]*[1/g(x)] = (x-1) /6(x^2+2)

Choose D.

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