Question: Please show all work. I need four options not including (8,1) Assume an ISBN (87 - 11 - 07559 - 7) is proposed for a

Please show all work. I need four options not including (8,1)
Assume an ISBN (87 - 11 - 07559 - 7) is proposed for a new book. The publisher does not want '5' to appear in the ISBN. Without changing other digits in the ISBN, provide four options to replace '5' which appears twice in the ISBN. For example, (8, 1) is an option. This is because (87 - 11 - 07819 - 7) is a valid ISBN
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