This software checks the validity of an identification number on a bank check.
Banks assign a check digit to an 8-digit routing number by using the last digit of the dot product of the routing number and the vector (7,3,9,7,3,9,7,3)
Use it to verify that 091902049 is valid. Now enter the same number with one digit incorrect. Was the error detected? Enter the number with two consecutive digits transposed. Was the error detected? Enter the number with the 2 and the 4 transposed. Was the error detected? Explain why or why not.
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