The answer to exercise marked [BB]can be found in the Back of the Book.
Find the digit A so that each of the following numbers is a valid ISBN number.
(a) [BB] 3-41-610927-A
(b) A-46-122837-4
(c) 9-12-3A4551-X
(d) [BB] 2-72-9188A6-2
(e) 8-9A-539828-4
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