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A local restaurant draws a business card from a jar every

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Manager
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Joined: 18 Jun 2011
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A local restaurant draws a business card from a jar every [#permalink]

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New post 19 Jun 2011, 07:05
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Question Stats:

53% (00:58) correct 47% (00:52) wrong based on 113 sessions

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A local restaurant draws a business card from a jar every day. The person whose name is drawn receives a free meal. Floyd drops his business card in the jar at the beginning of the month. Thirty days later, assuming that his card hasn't been drawn yet, what is the percent change in the probability that Floyd's card will be drawn from the jar on the next drawing?

(1) Only one card is drawn from the jar every day.

(2) On average, 10 business cards are added to the jar everyday.
[Reveal] Spoiler: OA
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Re: Probability D.S Problem [#permalink]

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New post 19 Jun 2011, 08:35
guygmat wrote:
A local restaurant draws a business card from a jar every day. The person whose name is drawn receives a free meal. Floyd drops his business card in the jar at the beginning of the month. Thirty days later, assuming that his card hasn't been drawn yet, what is the percent change in the probability that Floyd's card will be drawn from the jar on the next drawing?

(1) Only one card is drawn from the jar every day.

(2) On average, 10 business cards are added to the jar everyday.


None of the options give you the number of cards in the jar. Hence insufficient
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Re: Probability D.S Problem [#permalink]

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New post 20 Jun 2011, 19:25
hmm I thought we could just assume that initialy the box was emplty and then kept increasing 10 cards a day.
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Re: Probability D.S Problem [#permalink]

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New post 23 Jun 2011, 03:12
a no idea about the initial number of cards and cards added per day.Not sufficient.

b no idea about how many cards drawn/day and initial number of cards.

a+b initial number of cards still now known.

E it is.
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Re: Probability D.S Problem [#permalink]

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New post 06 Sep 2011, 12:34
Initial number of card is not provided. Hence my choice is E.
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Re: A local restaurant draws a business card from a jar every [#permalink]

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New post 24 Jan 2018, 06:33
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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: A local restaurant draws a business card from a jar every   [#permalink] 24 Jan 2018, 06:33
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