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Each day after an item is lost the probability of finding th

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Current Student
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Status: Up again.
Joined: 31 Oct 2010
Posts: 541
Concentration: Strategy, Operations
GMAT 1: 710 Q48 V40
GMAT 2: 740 Q49 V42
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Kudos [?]: 358 [0], given: 75

Re: Probability: Tricky one [#permalink]

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New post 02 Feb 2011, 12:07
Ok. So this problem has been officially laid to rest :)
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My GMAT debrief: http://gmatclub.com/forum/from-620-to-710-my-gmat-journey-114437.html

Current Student
avatar
Status: Up again.
Joined: 31 Oct 2010
Posts: 541
Concentration: Strategy, Operations
GMAT 1: 710 Q48 V40
GMAT 2: 740 Q49 V42
Followers: 20

Kudos [?]: 358 [0], given: 75

Re: Probability: Tricky one [#permalink]

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New post 03 Feb 2011, 02:23
144144 wrote:
so no answer for this one?
can someone give a similar question so i can c if i know how to solve it?

thanks.


The official answer is 1/2, but all members, including me, are getting the answer as 1/8. I will send an email to Bell Curves to see how they justify their explanation. So I guess we'll have to wait till then.

This question is more like fractions/ percentages than probability really. To see similar problems, you can check out problems on successive change in percentages type questions. A similar but not exactly same example:

Q: The population of a town increased by 10% in 2000 and by another 10% in 2001. What is the total percentage change in the population?

There are plenty such problems in this forum as well as prep books such as OG and Kaplan.
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My GMAT debrief: http://gmatclub.com/forum/from-620-to-710-my-gmat-journey-114437.html

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PS_May 13g [#permalink]

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New post 13 May 2013, 05:26
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Each day after an item is lost the probability of finding that item is halved. If 3 days after a certain item is lost the probability 1/64, what was the initial probability of finding the item?
a)1/32
b)1/8
c)1/4
d)1/2
e)1
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Re: PS_May 13g [#permalink]

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New post 13 May 2013, 05:31
Re: PS_May 13g   [#permalink] 13 May 2013, 05:31

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