About LHUN Algorithms

Sep 4 2013 8:00 AM

What is LHUN Algorithm?
How to check the valid credited card using LHUN.

Ex:       1 2 5 4   - 1 2 3 4 - 1 2 3 4 - 1 2 5 4

            4 5 2 1 - 4 3 2 1 - 4 3 2 1 - 4 5 2 1

                  6     +       4      +     4   +     6

                              = 20

If(20/10==0)
It is a valid card Process?

Is that one is right justify how?