<?php

$a=combination(28, 10);
$b=combination(15,10);
$a=$a/$b;
$a=number_format($a, 0, ',', '.');
echo $a;

//Kombinasyon hesabı --- kullanışı ----    combination(49, 6)
function combination($n, $r)
{
    if (($n != '1') && ($r == '1'))
        return $n;
    if ($n == $r)
        return '1';
    if (($n != '1') && ($n == '0'))
        return '1';
    $combination = factorial($n) / (factorial($r) * factorial($n - $r));
    return $combination;
}

function factorial($n)
{
    $f = 1;
    for ($i = $n; $i >= 1; --$i)
        $f *= $i;
    return $f;
}

//Kombinasyon hesabı sonu
?>