Which sequence correctly describes how to verify the check digit of a DEA number?

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Multiple Choice

Which sequence correctly describes how to verify the check digit of a DEA number?

Verifying a DEA number's check digit uses a weighted sum of the numeric portion after the initial letters. Take the digits in the odd positions (1st, 3rd, 5th) and add them. Then take the digits in the even positions (2nd, 4th, 6th) and add them, then multiply that even-position sum by 2. Add the two results together. The last digit of that total should equal the check digit at the end of the DEA number. This method helps catch common transcription errors because changing any single digit alters the total, so the final check digit is unlikely to still line up by accident. The described sequence matches these steps precisely: sum the odd-position digits, sum the even-position digits, multiply the even-sum by 2, add the two sums, and compare the last digit to the check digit. Other sequences that mix the steps differently or omit the weighting wouldn’t reliably verify the check digit.

Verifying a DEA number's check digit uses a weighted sum of the numeric portion after the initial letters. Take the digits in the odd positions (1st, 3rd, 5th) and add them. Then take the digits in the even positions (2nd, 4th, 6th) and add them, then multiply that even-position sum by 2. Add the two results together. The last digit of that total should equal the check digit at the end of the DEA number. This method helps catch common transcription errors because changing any single digit alters the total, so the final check digit is unlikely to still line up by accident. The described sequence matches these steps precisely: sum the odd-position digits, sum the even-position digits, multiply the even-sum by 2, add the two sums, and compare the last digit to the check digit. Other sequences that mix the steps differently or omit the weighting wouldn’t reliably verify the check digit.

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