Dear Prof. Sean Burbidge,
I  am a teacher of Mathematics Department of Calcutta University, Calcutta, India. I like to know the answer of the questions from you.
In every credit card the code for identification number consists of different blocks. Which block stands for what?
How to calculate check digit?
What kind of errors would be detected by this check digit?
Would you please give some time to reply my questions?
Thanking you.
Yours Sincerely,
M.K.Sen
 

 

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