The ISBN of the fifth edition of Elementary Numbers Theory and Its Applications is 0-32-123Q072, where Q is a digit. Find the value of Q.|||This is the old-style ISBN, when they used to be ten digits. Q is determined by solving the following equation.
0*10
+3*9
+2*8
+...
+Q*4
+...
+2*1=0 mod 11.
The new 13-digit ones have a slightly different checksum system.|||The seventh digit could be anything between 0 and 9. There's no way of telling from the information you've given.
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