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700+ quistion

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Source: — Problem Solving |
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by 4GMAT_Mumbai » Thu Jul 08, 2010 11:30 pm
Hi Ankrmit,

4^(2x-2) = 4^2x / 4^2

If 4^4x = 1600; 4^2x = 40.

Hence, 4^2x / 4^2 = 40 / 16. Guess it is [spoiler]5/2[/spoiler] Pls highlight if this is right / wrong.

I doubt if this question would be 700+ though ...
Last edited by 4GMAT_Mumbai on Fri Jul 09, 2010 12:02 am, edited 1 time in total.
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by ankurmit » Thu Jul 08, 2010 11:34 pm
Thanks Naveen..its nice explanation but you made some mistake here..check once .. ans is D


Actually I got this quistion in Manhattan test and they marked it as 700+ quistion :D
and I could not solve it so for me it was definitely a 700+ quistion..
Last edited by ankurmit on Thu Jul 08, 2010 11:44 pm, edited 1 time in total.
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by ankurmit » Thu Jul 08, 2010 11:39 pm
I could not post explanation from Manhattan here but they messed everything and they proved it a 800+ quistion :D
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by Rahul@gurome » Thu Jul 08, 2010 11:40 pm
4^(4x)= 1600 implies {4^(2x)}^2= 1600 or 4^(2x) = 40
4^(2x-2) = (4^2x)(4^-2) = 40/16 = 5/2
[spoiler]The correct answer is (D).[/spoiler]
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by ankurmit » Thu Jul 08, 2010 11:45 pm
Thanks Rahul..You are right..
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