Choose function in Java math?

Question

Sorry about the ambiguous title, I basically need to know how to use the choose function in java, to work out the chance of something happening, for example say I wanted to work out my chance of winning the lottery, on a calculator I'd do:

QUANTITY_OF_LOTTERY_NUMBERS CHOOSE 6

and that would return the chance of those six numbers appearing at random. I believe it's called the binomial theorem, but I dropped out of college before I could learn anything else about it :P

Anyway, if you do 49 choose 6 on Google for example, you'll see the function I'm trying to use

Question: How do I implement this function in Java code?

`How do I implement this function in Java code?` Do you want us to write it for you? If not, what specific problem are you having? — Sotirios Delimanolis, Mar 05 '14 at 19:01
@SotiriosDelimanolis - I think the question means - is there a JDK class or some class in a common library that has this function. — Dawood ibn Kareem, Mar 05 '14 at 19:01
I'm just curious if there is a `Math.choose(49, 6);` that I skipped over? — Shaun Wild, Mar 05 '14 at 19:01
And the answer is in this question http://stackoverflow.com/questions/2201113/combinatoric-n-choose-r-in-java-math - and this question is an obvious duplicate. — Dawood ibn Kareem, Mar 05 '14 at 19:03

score 1 · Answer 1 · answered Mar 05 '14 at 19:03

1

Apache Commons Math has it. If you are curious, you can read about Pascal's triangle.

http://commons.apache.org/proper/commons-math/apidocs/org/apache/commons/math3/util/CombinatoricsUtils.html#binomialCoefficient(int, int)

answered Mar 05 '14 at 19:03

Petar Minchev

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Choose function in Java math?

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