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[Resolvido] Duvida de novato


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Sou novato e estou com um problema.

package Probabilidade;

import java.util.Scanner;

public class Ler {

 static Scanner leia = new Scanner(System.in);


 public static void main(String args[]){

   int factorialN = 1;
   int factorialR = 1;
   int NcR;

   System.out.println("Digite o numero de objectos");
   int n = leia.nextInt();
   System.out.println("Digite o numero de objectos que são retirados");
   int r = leia.nextInt();

   for(int a = n; n == 1; n--){
     factorialN = factorialN*n;
     System.out.println("Sou "+ factorialN);
   }
   for(int b = r; r == 1; r--){
     factorialR = factorialR*r;
     System.out.println("Eu 2º sou "+ factorialR);
   }

   NcR = factorialN/(factorialR*(factorialN-factorialR));

   System.out.println("O numero de combinações é "+ NcR);
 }

o erro que me dá é na linha NcR = factorialN/(factorialR*(factorialN-factorialR)); e é o seguinte:

Exception in thread "main" java.lang.ArithmeticException: / by zero

at Probabilidade.Ler.main(Ler.java:30)

Alguém me pode dizer onde estou a errar sff.

Obrigado

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