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Math Help - Propability question help please! cheers! :-)

  1. #1
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    Propability question help please! cheers! :-)

    2 people are asked (indepently of one another) to choose 2 letters (each) from the letters of the word FRACTION.
    Find the probability that: (i) They have no letters in common
    (ii) They both choose the same pair of letters.

    Ans 15/28
    1/28

    please explain :-)
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  2. #2
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    Re: Propability question help please! cheers! :-)

    Quote Originally Posted by aimsywamesy View Post
    2 people are asked (indepently of one another) to choose 2 letters (each) from the letters of the word FRACTION.
    Find the probability that: (i) They have no letters in common
    (ii) They both choose the same pair of letters.
    Ans 15/28 & 1/28

    There are \binom{8}{2} to choose two letters.

    Thus, there are \binom{8}{2} for the first to pick and \binom{6}{2} for the second to pick totally different letters.
    Last edited by Plato; December 7th 2012 at 02:04 PM.
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  3. #3
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    Re: Propability question help please! cheers! :-)

    thank you... :-)
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