I have this code
public static BigInteger Factorial(int n) { BigInteger sum = n; BigInteger result = n; for (int i = n - 2; i > 1; i -= 2) { sum = (sum + i); result *= sum; } if (n % 2 != 0) result *= n / 2 +1; return result; }
I like this code it cuts iterations by half so if I need 100000! then it will do just 50000 iterations and done. But there is the problem if I need something like starting from 30000!and ending 100000!. Is any way to modify this code so we can calculate any range. As I can see this code uses the previous result to find a new one so I guess we can’t change this code.
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