public class Berechnungen {

    public long fakultaet(int n){

        long erg = 1;
            for (int i = 1; i <= n; i++) {
                erg = erg * i;
        }

        System.out.println("Die Berechnung er Fakultaet ergibt: " + erg);
        return erg;
    }

    public int ggT(int x, int y){

        while (x != y) {
            if (x > y) {
                x = x - y;
            } else {
                y = y - x;
            }
        }
        System.out.println("Der ggT betraegt: " + x);
        return x;
    }

    public long tresorKombinationen(long a, long b) {

        long p;

        long r = fakultaet((int)(a));
        long s = fakultaet((int) (a - b));

        p = r / s;

        System.out.println("Moeglichkeiten: " + p);
        return p;

    }
}