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probability question

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ridhamshah
 Post subject: probability question
 Post Posted: Wed Mar 03, 2010 12:14 pm 
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Students


Posts: 6
This question appeared in one of the practice tests I took. Can someone help me with this?

Tanya prepared 4 different letters to be sent to 4 different addresses. For each letter, she prepared an envelope with its correct address. If the 4 letters are to be put into the 4 envelopes at random, what is the probability that only 1 letter will be put into the envelope with it correct address?

(1) 1/24
(2) 1/8
(3) 1/4
(4) 1/3
(5) 3/8

Ans is (4) 1/3
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xro0manx
 Post subject: Re: probability question
 Post Posted: Mon Mar 08, 2010 11:22 am 
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Students


Posts: 1
Posted a while back. =)

post36172.html?hilit=probability#p36172
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ridhamshah
 Post subject: Re: probability question
 Post Posted: Mon Mar 08, 2010 3:14 pm 
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Students


Posts: 6
wonderful. Thanks for pointing it out :)
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mschwrtz
 Post subject: Re: probability question
 Post Posted: Tue Mar 30, 2010 12:44 pm 
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ManhattanGMAT Staff


Posts: 506
Good catch xro0manx, thanks.
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