/*	Fun‡”es - Introdu‡„o.
		C lculo combinat˘rio.
		PP, 96.12														*/

#include <stdio.h>

main()
{   int n, p, nmp;
	int nf, pf, nmpf, i;

	printf("C lculo de Combina‡”es de n p a p\n");
	printf("Introduza o valor de n :"); scanf("%d", &n);
	printf("Introduza o valor de p :"); scanf("%d", &p);

	/* C lculo de n!	*/
	nf = n;
	for (i=n-1; i>1; i--) nf = nf*i;

	/* C lculo de p!	*/
	pf = p;
	for (i=p-1; i>1; i--) pf = pf*i;

	/* C lculo de nmp!	*/
	nmp = n-p;
	nmpf = nmp;
	for (i=nmp-1; i>1; i--) nmpf = nmpf*i;

	printf("Combina‡”es de %d %d a %d = %d", n, p, p,nf/(pf*nmpf));
}