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probability :ben loosing

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probability :ben loosing [#permalink] New post 08 Apr 2010, 18:26
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If Ben were to lose the championship, Mike would be the winner with a probability of \frac{1}{4} , and Rob - \frac{1}{3} . If the probability of Ben being the winner is \frac{1}{7} , what is the probability that either Mike or Rob will win the championship?

(A) \frac{1}{12}
(B) \frac{1}{7}
(C) \frac{1}{2}
(D) \frac{7}{12}
(E) \frac{6}{7}



[Reveal] Spoiler:
Ans : C


src : gmatclubmath test : M07
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Re: probability :ben loosing [#permalink] New post 08 Apr 2010, 21:19
sushma0805 wrote:
If Ben were to lose the championship, Mike would be the winner with a probability of , and Rob - . If the probability of Ben winning is , what is the probability that either Mike or Rob will win the championship (there can be only one winner)?

A. 1/12
B. 1/7
C. 1/2
D. 7/12
E. 6/7



[Reveal] Spoiler:
Ans : C


src : gmatclubmath test : M07

Probability numbers are missing.
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Re: probability :ben loosing [#permalink] New post 09 Apr 2010, 13:39
might be interesting to solve once we know the probabilities.
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Re: probability :ben loosing [#permalink] New post 09 Apr 2010, 13:58
discussed previously ...
here it is if-ben-were-to-lose-the-championship-m07q12-75695.html
Re: probability :ben loosing   [#permalink] 09 Apr 2010, 13:58
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