The answer to exercise marked [BB]can be found in the Back of the Book.
Which of the following are valid ISBNs and which are not? Explain.
(a) [BB] 0-12-345678-9
(b) [BB] 0-43-209105-5
(c) 1-66-713242-6
(d) 9-41-288319-6
(e) 3-49-216627-X
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