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- #include <stdio.h>
- #define f1(a,b,c) for(a=b;a<=c;a++)
- #define f(a,b,c) for(a=b;a<c;a++)
- int C(int n,int r);
- int main(void) {
- int n,i,r;
- scanf("%d %d",&n,&r);
- printf("Reqd Value is: %d",C(n,r));
- }
- int C(int n,int r)
- {
- if(r==n)
- return 1;
- if(r==0)
- return 1;
- if(n<r)
- return 0;
- return C(n-1,r)+C(n-1,r-1);
- }
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