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A certain jar contains only w white marbles b black marbles

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Manager
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A certain jar contains only w white marbles b black marbles [#permalink] New post 29 Jul 2007, 23:21
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

A certain jar contains only w white marbles b black marbles and r red marbles. If one marble is chosen at random what is the probability that the marble chosen red greater than the probability that the marble chosen white ?

(1) (r/(b+w)) > (b/(r+w))

(2) b-w > r




Q2.

In a certain group of 10 members , 4 members teach only french and the rest teach only spanish and german. If the group is to choose a 3 member comitte, which must have at least 1 member who teaches French, How many different committee member can be chosen.


(a) 40
b) 50
c 64
d)80
e) 100


Plse help asap
Manager
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 [#permalink] New post 29 Jul 2007, 23:27
Figured out Q2 can someone help on Q1 thx....
Senior Manager
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Re: EMERGENCY HELP two questions asap test soon [#permalink] New post 29 Jul 2007, 23:27
tlntd42 wrote:
In a certain group of 10 members , 4 members teach only french and the rest teach only spanish and german. If the group is to choose a 3 member comitte, which must have at least 1 member who teaches French, How many different committee member can be chosen.

(a) 40
b) 50
c 64
d)80
e) 100



Getting E.

Total no. of possible committees = 10C3 = 120
No. of possible committees without any French teacher = 6C3 = 20

No. of committees with at least one French teacher = 120-20 = 100.
Senior Manager
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Joined: 04 Jun 2007
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Re: EMERGENCY HELP two questions asap test soon [#permalink] New post 29 Jul 2007, 23:31
tlntd42 wrote:
A certain jar contains only w white marbles b black marbles and r red marbles. If one marble is chosen at random what is the probability that the marble chosen red greater than the probability that the marble chosen white ?

(1) (r/(b+w)) > (b/(r+w))
(2) b-w > r



Discussed before.
Check here:
http://www.gmatclub.com/phpbb/viewtopic.php?t=44112&highlight=black++white++red
Senior Manager
Senior Manager
avatar
Joined: 04 Jun 2007
Posts: 346
Followers: 1

Kudos [?]: 20 [0], given: 0

 [#permalink] New post 29 Jul 2007, 23:32
And all the best for your test !! :-D
  [#permalink] 29 Jul 2007, 23:32
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A certain jar contains only w white marbles b black marbles

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