Q:

Write a C program to calculate the value of rPr

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YasminRadwan26
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2022-06-19
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The  nPr termed as permutation. They are useful in finding possible permutation of the number in the sets of numbers. To calculate combinations, we will use the formula nPr = n! /  (n – r)! , where n represents the total number of items, and r represents the number of items being chosen at a time.

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YasminRadwan26
2022-06-19
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#include <stdio.h>
int fact(int n)
{
    int i;
    int res = 1;
    for (i = 2; i <= n; i++)
    {
        res = res * i;
    }
    return res;
}
int getnPr(int n, int r)
{
    return fact(n)/fact(n-r);
}
int main()
{
    int num, r;
    long nprValue;
    printf("Enter the value of num = ");
    scanf("%d",&num);
    printf("Enter the value of r = ");
    scanf("%d",&r);
    nprValue = getnPr(num, r);
    printf("%d C %d = %ld\n", num, r, nprValue);
    return 0;
}

 

Output:

Enter the value of num = 10
Enter the value of r = 4
10 P 4 = 5040

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