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question from MGMAT [#permalink] New post 07 Aug 2009, 17:37
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A
B
C
D
E

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Question Stats:

100% (03:06) correct 0% (00:00) wrong based on 2 sessions
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One thing I don't get in the explanation is when it says the distance from A-D is 3 times the distance between C to D...then they multiply that distance by 6?? It's probably a stupid question but for some reason I'm not getting why to multiply by 6 instead of 3...

thanks
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Re: question from MGMAT [#permalink] New post 07 Aug 2009, 18:55
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sk88 wrote:

One thing I don't get in the explanation is when it says the distance from A-D is 3 times the distance between C to D...then they multiply that distance by 6?? It's probably a stupid question but for some reason I'm not getting why to multiply by 6 instead of 3...

thanks


You are right we will multiply the distance between C&D by 3 to get the distance between A&D.
I think the 6 in "6(5^13-5^12)" is a typo in the solution. They correct that in the subsequent calculation when they state: 5^13 - 3(5^13 - 5^12). And the final OA is correct.
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Intern
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Joined: 11 Jul 2009
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Re: question from MGMAT [#permalink] New post 08 Aug 2009, 04:06
ahh ok, thanks, I was getting really confused there. It's funny how one small typo can confuse everything.
Re: question from MGMAT   [#permalink] 08 Aug 2009, 04:06
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