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probabilty, urgent help !

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Manager
Manager
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Joined: 09 Jun 2010
Posts: 79
Followers: 1

Kudos [?]: 2 [0], given: 17

probabilty, urgent help ! [#permalink] New post 19 Jul 2010, 02:07
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

75% (01:01) correct 25% (00:00) wrong based on 4 sessions
A box contains 25 red blacks, 100 blue blocks, and 175 yellow blocks . What is the probabilty that a block picked at random from the box will be red ?
1/25
1/12
1/7
1/5
1/3

help me understand this
thanks
Manager
Manager
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Joined: 03 Jun 2010
Posts: 184
Location: United States (MI)
Concentration: Marketing, General Management
WE: Business Development (Consumer Products)
Followers: 4

Kudos [?]: 22 [0], given: 40

GMAT ToolKit User GMAT Tests User
Re: probabilty, urgent help ! [#permalink] New post 19 Jul 2010, 02:40
There are 25 reds out of 300 blocks.

25/300 = 1/12 (B)
Intern
Intern
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Joined: 05 Jul 2010
Posts: 27
Followers: 0

Kudos [?]: 19 [0], given: 7

GMAT Tests User
Re: probabilty, urgent help ! [#permalink] New post 19 Jul 2010, 03:33
You're right. It would be B.
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Re: probabilty, urgent help !   [#permalink] 19 Jul 2010, 03:33
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