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If a bottle is to be selected at random from a certain

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Joined: 16 Jan 2009
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If a bottle is to be selected at random from a certain [#permalink] New post 24 Jun 2009, 02:51
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If a bottle is to be selected at random from a certain collection of bottles, what is the probability that the bottle will be defective?
(1) The ratio of the number of bottles in the collection that are defective to the number that are not defective is 3:500.
(2) The collection contains 3,521 bottles.
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Re: DS : probability [#permalink] New post 24 Jun 2009, 02:54
IMO A.

first is sufficient. No of defective/ no of non defective = 3/500. Than prob of defective= no of defective / (no of defective + no of non defective) = 3 / 503 SUFFICIENT

second is insufficient because it only gives us the total no of glasses. Not the distribution of defective and non
Senior Manager
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Joined: 16 Jan 2009
Posts: 351
Location: United States
Schools: Anderson '15, Insead '13
GMAT 1: 710 Q50 V35
GPA: 3
WE: Sales (Telecommunications)
Followers: 2

Kudos [?]: 55 [0], given: 15

GMAT Tests User
Re: DS : probability [#permalink] New post 24 Jun 2009, 03:08
:cry: I just forgot the componendo dividendo rules and thought that 3:500 will not be helpful.
Thanks.

OA
[Reveal] Spoiler:
A

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Re: DS : probability   [#permalink] 24 Jun 2009, 03:08
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