If a bottle is to be selected at random from a certain : GMAT Data Sufficiency (DS)
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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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26 Feb 2011, 16:42
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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: If a bottle is to be selected at random from a certain colle [#permalink]

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26 Feb 2011, 17:26
banksy wrote:
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.

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 --> directly gives the answer: P=3/(500+3). Sufficient.

Or: defective/not defective=3x/500x, for some positive integer x --> P=defective/total=3x/(500x+3x)=P=3/(500+3)

(2) The collection contains 3,521 bottles. We still need the number of defective bottles. Not sufficient.

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Re: If a bottle is to be selected at random from a certain [#permalink]

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11 Dec 2014, 06:24
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Re: If a bottle is to be selected at random from a certain [#permalink]

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26 Jul 2016, 06:38
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: If a bottle is to be selected at random from a certain   [#permalink] 26 Jul 2016, 06:38
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# If a bottle is to be selected at random from a certain

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