Saturday, March 31, 2018

probability - What are the chances of getting at least 3 fours when rolling 5 dice?

What are the chances of getting at least three or more "fours" or higher number when rolling a fair six-sided die five times?



Actually, this is a problem I am curious about the answer and I can't find it anywhere. I would be glad if explained.


The question can be generalized to getting at least A times a number B or higher when rolling C dice of D sides. I would like to know the function that returns this probability given A, B, C and D parameters.


Examples of success: (1,4,4,3,4), (2,6,4,3,5), (6,1,5,5,4);


Examples of failure: (3,4,4,1,1), (6,5,1,2,1), (5,1,4,3,3).


Thanks.

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