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

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If a bottle is to be selected at random from a certain [#permalink] New post 11 Aug 2009, 11:18
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100% (01:52) correct 0% (00:00) wrong based on 2 sessions
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.


Please explain
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Re: probability [#permalink] New post 11 Aug 2009, 12:02
St. 1: Probability = 3/503. Sufficient.
St. 2: How many are defective, how many or not defective. Cannot be determined. Hence insufficient.

A for me.
Re: probability   [#permalink] 11 Aug 2009, 12:02
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