help!! jagged arrays

namespace Treehouse.CodeChallenges
{

    public static class MathHelpers
    {
        public static int[][] BuildMultiplicationTable(int maxFactor)
        {
            int[][] arr = new int[maxFactor][];// creating array of arrays.number of rows depend on maxfactor

            for (int rowindex = 0; rowindex < arr.Length; rowindex++)
            {
                arr[rowindex] = new int[maxFactor];//creating colums in each row using maxfactor

                for (int colIndex = 0; colIndex < arr[rowindex].Length; colIndex++)
                {
                    arr[rowindex][colIndex] = rowindex * colIndex;//initialising values for each num
                }
            }

            return arr;

        }
    }

}