1. #1
    Rio DiNero
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    What is the probability of hitting three points in a row in craps?

    I have a limited math backround, and don't even know where to start. I have read that it is about 3%, but IDK how that number was calculated. Like to hear what the math guys at SBR think, seems like it would be a very difficult math problem.

  2. #2
    u21c3f6
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    Three passes or specifically 3 points which is quite different and a more involved calculation?

    Joe.

  3. #3
    u21c3f6
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    Quote Originally Posted by Rio DiNero View Post
    I have a limited math backround, and don't even know where to start. I have read that it is about 3%, but IDK how that number was calculated. Like to hear what the math guys at SBR think, seems like it would be a very difficult math problem.
    Assuming specifically that you throw a point and make that point three times in a row is as follows:

    The chance of throwing a point is 24/36 and the chance of making that point is approx 9.75/24 or approx .6667 * .406 = .2707 to throw and make one point. Three times in a row is approx: .2707 ^ 3 = .0198

    Joe.

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    Rio DiNero
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    Quote Originally Posted by u21c3f6 View Post
    Three passes or specifically 3 points which is quite different and a more involved calculation?

    Joe.
    Yes, this is what I should have specified. I want to include 7 and 11 opening roll.
    Thanks

  5. #5
    MonkeyF0cker
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    Quote Originally Posted by Rio DiNero View Post
    Yes, this is what I should have specified. I want to include 7 and 11 opening roll.
    Thanks
    That would be a combinatorial problem.

    Let's call A the probability of winning on the come out roll. B is the probability of winning the point.

    A = .2222
    B = .2707

    What we're looking for are all of the permutations with repetition where the event will take place. To find the number, it would simply be the number of choices (2) to the number of events (3)... Or 2^3 = 8.

    Here are the different permutations:

    AAA
    AAB
    ABB
    ABA
    BAA
    BAB
    BBA
    BBB

    To find the probability of each occurring, we simply multiply their respective probabilities together. And to find the whole, we add them up.

    AAA = 0.010970645048
    AAB = 0.013365227788
    ABB = 0.016282480478
    ABA = 0.013365227788
    BAA = 0.013365227788
    BAB = 0.016282480478
    BBA = 0.016282480478
    BBB = 0.019836487243

    Adding them all together, we get 0.119750257089 or 11.975% of winning 3 pass line wagers in a row.

  6. #6
    MadTiger
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    Great work, MonkeyF0cker.

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    MadTiger
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    Quote Originally Posted by u21c3f6 View Post
    Assuming specifically that you throw a point and make that point three times in a row is as follows: The chance of throwing a point is 24/36 and the chance of making that point is approx 9.75/24 or approx .6667 * .406 = .2707 to throw and make one point. Three times in a row is approx: .2707 ^ 3 = .0198 Joe.
    Thanks for your efforts.

  8. #8
    MonkeyF0cker
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    LOL. I actually overthought the problem. Although, it's the same result. You can simply add the two probabilities together and cube them. (.2222 + .2707)^3 = 0.119750257089.

    Duh.
    Points Awarded:

    Rio DiNero gave MonkeyF0cker 5 SBR Point(s) for this post.


  9. #9
    Rio DiNero
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    Quote Originally Posted by MonkeyF0cker View Post
    LOL. I actually overthought the problem. Although, it's the same result. You can simply add the two probabilities together and cube them. (.2222 + .2707)^3 = 0.119750257089.

    Duh.
    Thanks for your insight.

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