A teacher created a 6-digit student identification number so that the sixth digit is the check digit. The code will use a mod 8 check-digit scheme; that is, the check digit is congruent to d1d2d3d4d5 mod 8.
a. What digits are possible as check digits?
b. Find the check digit for the identification code 52891.
c. Find the missing digit in the code 3017?2.
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