What would be the correct last digit of the DEA number BS5927683 if it were accurate?

To determine the correct last digit of a DEA number, a specific mathematical check can be performed. This method involves using the first six digits of the DEA number to calculate a checksum.

For the DEA number BS5927683, the procedure is as follows:

1. Identify the digits: The DEA number BS5927683 can be broken down into its significant digits: 5, 9, 2, 7, 6, 8.

2. Odd and Even positions: The positions of these digits are taken into account:

• Odd positions are 5 (1st), 2 (3rd), 6 (5th) which gives 5 + 2 + 6 = 13.

• Even positions are 9 (2nd), 7 (4th), 8 (6th) which gives 9 + 7 + 8 = 24.

3. Calculate the sum:

• Multiply the sum of the even positions by 2: 24 × 2 = 48.

• Now combine this with the sum of the odd positions: 48 + 13 = 61.

4. Finding the last digit: The final