The answer to exercise marked [BB]can be found in the Back of the Book.
Which of the following are valid universal product numbers and which are not? Explain.
(a) [BB] 0-12345-67890-1
(b) 1-66326-73551-5
(c) [BB] 2-52998-17394-9
(d) 9-53889-22687-3
(e) 8-41285-19384-2
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