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If a student is selected at random from Learngood

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Joined: 01 Apr 2008
Posts: 909
Schools: IIM Lucknow (IPMX) - Class of 2014
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Kudos [?]: 190 [0], given: 18

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If a student is selected at random from Learngood [#permalink] New post 25 Oct 2009, 04:18
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

71% (01:15) correct 29% (00:05) wrong based on 6 sessions
If a student is selected at random from Learngood Elementary, what is the probability that the student will be a boy?


(1) There are 480 students at Learngood.

(2) At Learngood, the ratio of boys to girls is 7 : 5
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Joined: 18 Aug 2009
Posts: 333
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Kudos [?]: 155 [0], given: 13

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Re: prob4 [#permalink] New post 25 Oct 2009, 09:54
IMO B

State 1: We do not know how many students are boys out of 480. Insufficient
State 2: 7/12. Sufficient
Re: prob4   [#permalink] 25 Oct 2009, 09:54
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If a student is selected at random from Learngood

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