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Math Help - Sorry, One More Probability Word Problem!

  1. #1
    Newbie glue'd'n'math's Avatar
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    Arrow Sorry, One More Probability Word Problem!

    Ok, this is the last one I have. Could someone please brake probability down to me? This is hopefully the last probability problem. -Probability problem #3-


    What is the probability that when 3 spinners with the numbers 1-3
    are spun, that at least two will land on a prime number?

    Thank you very much!
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  2. #2
    Flow Master
    mr fantastic's Avatar
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    Quote Originally Posted by glue'd'n'math View Post
    Ok, this is the last one I have. Could someone please brake probability down to me? This is hopefully the last probability problem. -Probability problem #3-


    What is the probability that when 3 spinners with the numbers 1-3
    are spun, that at least two will land on a prime number?

    Thank you very much!
    Same idea as previous questions, although more tedious this time.

    List all the possibilities - carefully! (there are 3^3 = 27):

    1, 1, 1
    1, 1, 2
    1, 1, 3

    etc. etc.

    Now count how many of these have at least two prime numbers (NB: 2 is a prime number).

    etc.
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