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# Probability

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Manager
Joined: 24 Jul 2010
Posts: 91
Followers: 0

Kudos [?]: 10 [1] , given: 43

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31 Mar 2013, 16:11
1
KUDOS
I need help on reasoning on this one. Sally has 1/3 chance to pass her physics exam, 1/2 her math exam and 1/4 her English exam. What is the probability of her passing exactly one exam.

Can I say it's P(pass physics)*P(NOT pass math)*P(NOT pass english) + P(NOT pass physics)*P(pass math)*P(NOT pass english) + P(NOT pass physics)*P(NOT pass math)*P(pass english)?
Manager
Joined: 24 Jul 2010
Posts: 91
Followers: 0

Kudos [?]: 10 [1] , given: 43

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01 Apr 2013, 03:46
1
KUDOS
jumsumtak wrote:
score780 wrote:
I need help on reasoning on this one. Sally has 1/3 chance to pass her physics exam, 1/2 her math exam and 1/4 her English exam. What is the probability of her passing exactly one exam.

Can I say it's P(pass physics)*P(NOT pass math)*P(NOT pass english) + P(NOT pass physics)*P(pass math)*P(NOT pass english) + P(NOT pass physics)*P(NOT pass math)*P(pass english)?

Exactly!

Thanks man. So that would be: 1/3*1/2*3/4+2/3*1/2*3/4+2/3*1/2*1/4?
VP
Joined: 23 Mar 2011
Posts: 1113
Concentration: Healthcare, Strategy
Schools: Duke '16 (M)
Followers: 78

Kudos [?]: 491 [0], given: 463

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02 Apr 2013, 00:20
score780 wrote:
jumsumtak wrote:
score780 wrote:
I need help on reasoning on this one. Sally has 1/3 chance to pass her physics exam, 1/2 her math exam and 1/4 her English exam. What is the probability of her passing exactly one exam.

Can I say it's P(pass physics)*P(NOT pass math)*P(NOT pass english) + P(NOT pass physics)*P(pass math)*P(NOT pass english) + P(NOT pass physics)*P(NOT pass math)*P(pass english)?

Exactly!

Thanks man. So that would be: 1/3*1/2*3/4+2/3*1/2*3/4+2/3*1/2*1/4?

Yes. That would be the answer.
Re: Probability   [#permalink] 02 Apr 2013, 00:20
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