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

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Director
Joined: 09 Aug 2006
Posts: 525
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Kudos [?]: 39 [0], given: 0

If a bottle is to be selected at random from a certain [#permalink]  19 Jun 2007, 21:41
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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.
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5078
Location: Singapore
Followers: 22

Kudos [?]: 184 [0], given: 0

St1:
d:nd = 3:500
If there are n bottles, # of defective bottles = 3n/503.
So, P(defective) = 3/503 -> sufficient.

St2:
Insufficient. We do not have other details.

Ans A
Manager
Joined: 14 Mar 2007
Posts: 238
Followers: 1

Kudos [?]: 1 [0], given: 0

for me is A since the ratio is suff. for obtaining the probability desired
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