If a bottle is to be selected at random from a certain : DS Archive
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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]

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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.
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19 Jun 2007, 23:35
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
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20 Jun 2007, 11:43
for me is A since the ratio is suff. for obtaining the probability desired
20 Jun 2007, 11:43
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# If a bottle is to be selected at random from a certain

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