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A ___________ is used when an extra digit is added to a coded field to make sure it the entered data is correct (like social security numbers).
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A ___________ is used when an extra digit is added to a coded field to make sure it the entered data is correct (like social security numbers).

User ObjectDB
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A Check digit check is used when an extra digit is added to a coded field to make sure it the entered data is correct (like social security numbers).
User Andres Suarez
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