com.vcollaborate.math

Class CombinatoricUtils

java.lang.Object

com.vcollaborate.math.CombinatoricUtils

public final class CombinatoricUtils
extends Object

Method Summary

Modifier and Type	Method and Description
static long	combinations(int n, int r) Calculates the possible combinations of chosen types (r) from a list of types (n) or n over r.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

combinations

public static final long combinations(int n,
                                      int r)

Calculates the possible combinations of chosen types (r) from a list of types (n) or n over r.

Mathematical it is following formula:
\(\binom{n}{r} = \frac{n!}{r!(n-r)!}\)