- pow: documentation ( source)
<?php
//Enter your code here, enjoy!
$s = 6;
$n = 2;
$k = 7;
$z = 0;
$i = 0;
$j = $k;
while ($j <= $s*$n)
{
while ($i <= (($j-$n)/$s))
{
$fact1 = gmp_fact($n)/(gmp_fact($i)*gmp_fact($n-$i));
echo $fact1;
//$fact2 = gmp_fact($j-$s*$i-1,$n-1);
//$fact2 = gmp_fact($n-$i)/(gmp_fact($j-$s*$i-1)*gmp_fact($n-$i));
$fact2 = gmp_fact($j-$s*$i-1)/(gmp_fact($n-$i)*gmp_fact($n-$i));
//echo $fact2;
$z = $z + pow(-1, $i) * $fact1 * $fact2;
//$fact1 = gmp_fact(5); // 5 * 4 * 3 * 2 * 1
//$z = gmp_strval($z);
$i++;
}
$j++;
}
//echo pow(gmp_init($z)*(1/$s),$n);
?>