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#include <iostream>
using namespace std;
int fact(int n)
{
    if(n < 0)
        return 0;
    if (n == 0)
        return 1;
    else
        return n * fact(n - 1);
}

int main()
{
    int n = 6;
    int m = 4;
    int answer;
    answer = (fact(n))/(fact(n-m));
    cout << "Factorial: " << " = " << answer << endl;
    return 0;
}