SOLVED:Consider the eight-digit bank identification number a1 a2 …a8, which is followed by a ninth check digit a9 chosen to satisfy the congruence a9=7 a1 3 a2 9 a3 7 a4 3 a5 9 a6 7 a7 3 a8(10) (a) Obtain the check digits that should be appended to the two numbers 55382006 and 81372439 . (b) The bank identification number 237 a4 18538 has an illegible fourth digit. Determine the value of the obscured digit.

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