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

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Senior Manager
Joined: 16 Jan 2009
Posts: 356

Kudos [?]: 227 [0], given: 16

Concentration: Technology, Marketing
GMAT 1: 700 Q50 V34
GPA: 3
WE: Sales (Telecommunications)
If a bottle is to be selected at random from a certain [#permalink]

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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.
_________________

Lahoosaher

Kudos [?]: 227 [0], given: 16

Senior Manager
Joined: 23 Jun 2009
Posts: 360

Kudos [?]: 133 [0], given: 80

Location: Turkey
Schools: UPenn, UMich, HKS, UCB, Chicago
Re: DS : probability [#permalink]

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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

Kudos [?]: 133 [0], given: 80

Senior Manager
Joined: 16 Jan 2009
Posts: 356

Kudos [?]: 227 [0], given: 16

Concentration: Technology, Marketing
GMAT 1: 700 Q50 V34
GPA: 3
WE: Sales (Telecommunications)
Re: DS : probability [#permalink]

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24 Jun 2009, 03:08
I just forgot the componendo dividendo rules and thought that 3:500 will not be helpful.
Thanks.

OA
[Reveal] Spoiler:
A

_________________

Lahoosaher

Kudos [?]: 227 [0], given: 16

Re: DS : probability   [#permalink] 24 Jun 2009, 03:08
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# If a bottle is to be selected at random from a certain

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