function

DeepakR: Master | Next Rank: 500 Posts; Posts: 158; Joined: Tue Sep 30, 2008 8:47 am; Thanked: 23 times; Followed by:1 members; GMAT Score:660

by DeepakR » Sat Jul 04, 2009 5:29 pm

f(a)=-1/a=-1/2 hence we get a=2.
Similarly, f(ab)=-1/ab=1/6 so ab=-6. Substitute a=2 we get, b=-3
OA = D

-Deepak

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