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Thursday, February 17, 2011

Ring Around the Marbles

A boy has four red marbles and eight blue marbles. He arranges his twelve marbles randomly, in a ring. What is the probability that no two red marbles are adjacent?
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2 comments:

  1. Unknown2/18/2011 9:51 AM

    I'll give you a hint, since no one's answered: It's close to 1/2.

    ReplyDelete
  2. Anonymous4/19/2011 12:02 AM

    no chance... ring has no side at all

    ReplyDelete

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