Question: A code a1 a2 a3 a4 uses the last last digit, a4 , as the check digit. The check digit is found using the formula
A code a1 a2 a3 a4 uses the last last digit, a4 , as the check digit. The check digit is found using the formula 3 a1 + 9 a2 + 4 a3 mod 9 Will this check digit find all single digit errors in the first position?
Yes, it will find all single digit errors
No, it will miss errors where |a1 e1| = 1
No, it will miss errors where |a1 e1| = 2
No, it will miss errors where |a1 e1| = 3
No, it will miss errors where |a1 e1| = 4
No, it will miss errors where |a1 e1| = 5
No, it will miss errors where |a1 e1| = 6
No, it will miss errors where |a1 e1| = 7
No, it will miss errors where |a1 e1| = 8
No, it will miss errors where |a1 e1| = 9
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