The answer to exercise marked [BB]can be found in the Back of the Book.
In each of the following cases, find the digit x so that the given number is a valid universal product number.
(a) [BB] 0-12x89-29109-4
(b) 1-29347-49x26-8
(c) 4-29217-10258-x
(d) 5-91057-x9332-2
(e) x-79154-91937-6
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