Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Calculation/MathTrig.php
public static function MULTINOMIAL(...$args)
    {
        $summer = 0;
        $divisor = 1;
        // Loop through arguments
        foreach (Functions::flattenArray($args) as $arg) {
            // Is it a numeric value?
            if (is_numeric($arg)) {
                if ($arg < 1) {
                    return Functions::NAN();
                }
                $summer += floor($arg);
                $divisor *= self::FACT($arg);
            } else {
                return Functions::VALUE();
            }
        }

        // Return
        if ($summer > 0) {
            $summer = self::FACT($summer);

            return $summer / $divisor;
        }

        return 0;
    }
public static function MULTINOMIAL(...$args)
    {
        $summer = 0;
        $divisor = 1;
        // Loop through arguments
        foreach (Functions::flattenArray($args) as $arg) {
            // Is it a numeric value?
            if (is_numeric($arg)) {
                if ($arg < 1) {
                    return Functions::NAN();
                }
                $summer += floor($arg);
                $divisor *= self::FACT($arg);
            } else {
                return Functions::VALUE();
            }
        }

        // Return
        if ($summer > 0) {
            $summer = self::FACT($summer);

            return $summer / $divisor;
        }

        return 0;
    }
MULTINOMIAL.

Returns the ratio of the factorial of a sum of values to the product of factorials.

@param array of mixed Data Series

@return float