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Homework Help: A probability questoin

  1. Aug 30, 2009 #1
    1. The problem statement, all variables and given/known data

    A new lifeform has been discovered in the sea. In particular, these sea-creatures
    come in THREE sexes, which are indistinguishable (except by other sea-creatures). If A robot captures N specimens, what is the probability these
    chocies will allow a “mated triple” with its promise of more little sea-creatures to come?

    2. Relevant equations
    This homework is supposed to be on conditional probabilities and counting methods, so I suppose Baye's Theorem and Law of Total Probabilities would be useful

    3. The attempt at a solution
    Unfortunately, I truly have no idea where to begin this problem.
    Any ideas?
  2. jcsd
  3. Aug 30, 2009 #2
    I suspect you are to assume the genders are equally likely in the sea-creature population.

    I would first try this indirectly but trying to calculate the probability that all N creatures belong to two identical genders.

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