combination calculator

[genc27]

Hi,
I am tring to create a simple calculator which will give me the result of combination of the number ı input via input boxes..
for example (49-6)! output is 13.983.816 .Suppose that I have got 1 winning 6 ticket, how many winning 5s and how many winning 4s .have I got...?
I have this link but it is not enough.
http://www.easycalculation.com/stati...ombination.php
thanks

[fil_razorback]

Here is how to calculate combinations :
You shouldnt have used the ! symbol in your example because it means factorial. For example, 5! = 1*2*3*4*5 = 120
Now onto the main topic, the formula that will calculate C(b - a) is b! / (a! * (b-a)!). For example, C(49, 6) = 49! / (6! * 43!)
Action script :

code:

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function fact (a : Number) {

return (a <= 0 ? 1 : a * fact (a - 1)); //It makes no sense for a to be < 0 but returning 1 is better than an infinite loop.

}

function combinations (a : Number, b : Number) {

return (fact(b)) / (fact(a) * fact(b-a));

}

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