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Say you have 5 coins. 1 coin has heads on both sides and the

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CEO
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Joined: 17 Nov 2007
Posts: 3604
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
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Re: Difficult probability question [#permalink] New post 11 Mar 2010, 06:29
Expert's post
I agree with Bunuel that conditional probability concept is not tested(or very rarely tested) in GMAT or I just can't recall any problem in OG and GMATPrep using the concept. After I reread the question, yeah, 8/9 makes more sense.
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Re: Difficult probability question [#permalink] New post 11 Mar 2010, 07:49
it is clear that 1/5 is the probability of picking the coin with head in both side.

I agree with 100% with "TheSituation" answer
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Re: Difficult probability question [#permalink] New post 29 Aug 2011, 04:07
can u please explain fully once again .......... i m really getting very confused in this ques.

@ Brunel- if u can reply in a simpler manner for this ques ..pls
thanks in advance
Re: Difficult probability question   [#permalink] 29 Aug 2011, 04:07
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Say you have 5 coins. 1 coin has heads on both sides and the

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