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Math Help - Multiple Choice questions

  1. #1
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    Smile Multiple Choice questions

    An unprepared student makes random guesses for 6 multiple choice questions that have selections a - e. Find the probability that there is at least one correct answer.
    A) .672
    B) .200
    C) .738
    D) .800

    Now i don't want the answer i just would like to know how to figure it out any help would be very much appreciated.
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  2. #2
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    P(gets at least 1 right) = 1 - P(gets none right)

    can you work out P(gets none right) ?
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  3. #3
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    oh ok yeah i got it now thanks! so i would be .73792 witch is awnser c .738. Can i ask you another question?
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  4. #4
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    Quote Originally Posted by NathanElder View Post
    oh ok yeah i got it now thanks! so i would be .73792 witch is awnser c .738. Can i ask you another question?
    Rule #9: http://www.mathhelpforum.com/math-he...hp?do=vsarules New question - new thread.
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