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- RaymondLv 74 years ago
When a number is congruent to 0 (mod "n"), it simply means that the number is exactly divisible by that number "n".
In your question, the final total (including the check digit) must be congruent to 0 (mod 10), which means:
-- the total is divisible by 10, which means the same as:
-- the number ends with a zero.
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