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Manager
Joined: 16 Feb 2009
Posts: 57
Schools: Anderson FEMBA

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02 Mar 2009, 12:45
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Hey Guys,

I cleared my history of GMAT questions before I copied it down but I remember the question clear as day.

I don't have the OA or the original answer choices so I'm hoping some of you probability pros can chime in.

See attachment...
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Probability_GMAT prep question.doc [23.5 KiB]

Manager
Joined: 16 Feb 2009
Posts: 57
Schools: Anderson FEMBA

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02 Mar 2009, 15:56
I believe this was from GMAT Prep Test #1. It was one of the last few questions in quant.

Has anyone else seen this question? If you have it, can you post the actual screen print from GMAT Prep so we can see the answer choices?

Well, to get some discussion going I'll give you all my point of view (now that time isn't a factor):

There are 3 paths to get to box #2.
(a) L, L, R
(b) L, R, L
(c) R, L, L

Each L or R has a 1/2 probability, so it appears each path produces a 1/8 chance.
Since there are three different approaches, it looks as if the total probability is 3/8 (that the ball will reach the #2 box).

Thoughts? Agree? Disagree? Different approaches?
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