NPR

This algorithm finds all possible rearrangement of the element i.e all the possible permutation value.

• C#
• VB.Net
• C
• C++
• PHP

									function Factorial($number)
{
	if ($number < 0)
		return -1; //Error

	$result = 1;

	for ($i = 1; $i <= $number; $i++)
		$result *= $i;

	return $result;
}

function NPR($n, $r)
{
	return Factorial($n) / Factorial($n - $r);
}
								

Example

									$npr = NPR(5, 2);
								

Output

									20