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GMATPrep Probability Problem

This topic has 1 member reply
projase Junior | Next Rank: 30 Posts Default Avatar
Joined
03 Dec 2006
Posted:
14 messages

GMATPrep Probability Problem

Post Thu Dec 07, 2006 12:52 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    Four letters are going to be send to four different addresses.

    If the letters are to be put into the 4 enveolpes at random, what is the probability that only 1 letter will be put into the envelope with its correct address?

    Alt 1/24; 1/8; 1/4; 1/3; 3/8

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    thankont Senior | Next Rank: 100 Posts
    Joined
    15 Dec 2006
    Posted:
    41 messages
    Followed by:
    1 members
    Post Fri Dec 15, 2006 2:28 pm
    Not quite sure here but one ans. could be
    4C1*1/4*2/3*1/2
    combination applies since we have 4 letters
    1/4 for 1st letter to be put in correct place
    2/3 for 2nd letter to be put in wrong place
    1/2 for 3rd letter to be put in wrong place
    so ans is 1/3...

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