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Math Help - Probability Distrubution- Binomal or geometric?

  1. #1
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    Probability Distrubution- Binomal or geometric?

    Hi guys....

    i dunt realli understand how to do this question:

    what is the probability that a triple for a dice..will occur within the first 5 rolls?

    also, im not sure if this is Binomal or geometric...

    Thanks in advance.
    Last edited by questiongirl; May 5th 2010 at 06:14 PM.
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  2. #2
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    Quote Originally Posted by questiongirl View Post
    Hi guys....

    i dunt realli understand how to do this question:

    what is the probability that a triple will occur within the first 5 rolls?

    also, im not sure if this is Binomal or geometric...

    Thanks in advance.
    A triple? Do you mean probability of a 3 in the first five rolls of a single dice?
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  3. #3
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    like getting triple 1s,2s,3s,4s..... for a dice. sorry i should have clarify the question.
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    Super Member Anonymous1's Avatar
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    Quote Originally Posted by questiongirl View Post
    like getting triple 1s,2s,3s,4s..... for \color{red}{\text{a dice.}} sorry i should have clarify the question.
    I assume you mean 3 dice, then?
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    Quote Originally Posted by Anonymous1 View Post
    I assume you mean 3 dice, then?
    lol...i guess its getting late my typing has failed.. i mean 3 dice
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    Pr(\text{triple}) = \frac{6}{6^3} = \frac{1}{36} since there are  6^3 ways of rolling 3 die, and only  6 of the outcomes are triples.

    The desired probability is:

    1- [{5\choose 0}(\frac{1}{36})^0(1-\frac{1}{36})^{5-0}] = 1- (\frac{35}{36})^5 = \frac{71}{1296}

    Oh, and yeah, it's a binomial.
    Last edited by Anonymous1; May 5th 2010 at 09:21 PM.
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