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Answer to Question #85758 in Python for Fikir Yashenifal

Question #85758
SBN-13 is a new standard for indentifying books. It uses 13 digits d1d2d3d4d5d6d7d8d910d11d12d13 . The last digit d13 is a checksum, which is calculated from the other digits using the following formula:

10 - (d1 + 3*d2 + d3 + 3*d4 + d5 + 3*d6 + d7 + 3*d8 + d9 + 3*d10 + d11 + 3*d12) % 10

If the checksum is 10, replace it with 0. Your program should read the input as a string. Display “incorrect input” if the input is incorrect.
Expert's answer
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