Math(4)

1:
#include<stdio.h>
///***NCR
int main(){
  int n,r,ncr;
  printf("Enter any two numbers->");
  scanf("%d %d",&n,&r);
  ncr=fact(n)/fact(r)*fact(n-r);
  printf("The NCR factor of %d and %d is %d",n,r,ncr);
  return 0;
}
 int fact(int n){
  int i=1;
  while(n!=0){
      i=i*n;
      n--;
  }
  return i;
 }



output: depend on your value

2:

#include<stdio.h>
///***NPR
int main(){
  int n,r,ncr;
  printf("Enter any two numbers->");
  scanf("%d %d",&n,&r);
  ncr=fact(n)/fact(n-r);
  printf("The NPR factor of %d and %d is %d",n,r,npr);
  return 0;
}
 int fact(int n){
  int i=1;
  while(n!=0){
      i=i*n;
      n--;
  }
  return i;
 }

output: depend on your value

3:
#include<stdio.h>
///***Leap year
int main(){
    int year;

    printf("Enter any year: ");
    scanf("%d",&year);

    if(((year%4==0)&&(year%100!=0))||(year%400==0))
         printf("%d is a leap year",year);
    else
         printf("%d is not a leap year",year);

    return 0;
}

output: depend on your value