Talk:Luhn algorithm: Difference between revisions

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I am very confused. Why do some of the implementations completely ignore the check digit and others don't? And why would the digit be ignored? <!-- Template:Unsigned --><small class="autosigned">—&nbsp;Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[User:Sollyucko|Sollyucko]] ([[User talk:Sollyucko#top|talk]] • [[Special:Contributions/Sollyucko|contribs]]) 18:29, 4 April 2019 (UTC)</small> <!--Autosigned by SineBot-->
 
== "third row": what&where is it? ==
 
Twice, the "Description" mentions a "third row". I have no idea where that third row is and what it contains. What are rows one&two?