41 lines
765 B
C
41 lines
765 B
C
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#include <stdio.h>
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long factorial(int);
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long find_ncr(int, int);
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long find_npr(int, int);
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int main()
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{
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int n, r;
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long ncr, npr;
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printf("Enter the value of n and r\n");
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scanf("%d%d",&n,&r);
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ncr = find_ncr(n, r);
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npr = find_npr(n, r);
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printf("%dC%d = %ld\n", n, r, ncr);
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printf("%dP%d = %ld\n", n, r, npr);
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return 0;
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}
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long find_ncr(int n, int r)
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{
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long result;
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result = factorial(n)/(factorial(r)*factorial(n-r));
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return result;
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}
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long find_npr(int n, int r)
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{
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long result;
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result = factorial(n)/factorial(n-r);
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return result;
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}
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long factorial(int n)
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{
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int c;
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long result = 1;
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for (c = 1; c <= n; c++)
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result = result*c;
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return result;
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}
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