Reply To: Week 2 Video Lessons

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#28240
KennethWilliams
Keymaster

Hi Satya,
It is still worth using the digit sum check. Together with checking the first and last digits it means we can usually be highly confident of a result if not absolutely certain. Thanks to Mallika for her comments.
We will soon see another digit sum checking device, based on 11 rather than 9.

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