The International Standard Book Number (ISBN) used in many libraries consists of nine digits a1a2…a9 followed by a tenth check digit a10, which satisfies
Determine whether each of the ISBNs below is correct:
(a) 0-07-232569-0 (United States).
(b) 91-7643-497-5 (Sweden).
(c) 1-56947-303-10 (England).
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