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# Raffle tickets

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Senior Manager
Joined: 10 Nov 2010
Posts: 267
Location: India
Concentration: Strategy, Operations
GMAT 1: 520 Q42 V19
GMAT 2: 540 Q44 V21
WE: Information Technology (Computer Software)
Followers: 5

Kudos [?]: 238 [0], given: 22

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20 Feb 2011, 09:26
00:00

Difficulty:

(N/A)

Question Stats:

100% (01:21) correct 0% (00:00) wrong based on 9 sessions

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Pls chk the image
[Reveal] Spoiler: OA

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Raffle_tickets.JPG [ 23.72 KiB | Viewed 1458 times ]

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The proof of understanding is the ability to explain it.

Last edited by GMATD11 on 20 Feb 2011, 09:57, edited 1 time in total.
Math Forum Moderator
Joined: 20 Dec 2010
Posts: 2021
Followers: 157

Kudos [?]: 1556 [0], given: 376

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20 Feb 2011, 09:33
350-101+1 = 250

299-200+1 = 100

Probability = 100/250 = 2/5

Ans: "A"
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Joined: 14 Feb 2011
Posts: 196
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Kudos [?]: 110 [0], given: 3

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20 Feb 2011, 09:36
Shouldn't the number of tickets with 2 in hundred's digit be 100 - from 200 to 299? Hence, 100 favorable outcomes out of a possible 250 outcomes and hence probability is 100/250 = 2/5. I think answer should be 2/5 and hence A.
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Location: Pune, India
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Kudos [?]: 11922 [0], given: 221

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20 Feb 2011, 20:32
GMATD11 wrote:
Pls chk the image

Reading this question reminded me of something that I like to tell my students:

"When you solve a question, don't just solve that question. Think what you would have done had the question been a little different. Apply as many different variations as you can and try to solve each. That will help you build concept."

e.g. they have made the question a little simpler by giving you that you need numbers with 2 in the hundred's place. What if the question asked for numbers with a 2 (in any place) or numbers with only one 2 (in any place) etc.

The more you analyze the problems, the better you will get at answering tougher questions.
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Re: Raffle tickets   [#permalink] 20 Feb 2011, 20:32
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