• anonymous
I do not understand this question: "Show that the check digit $$x_{10}$$ in an ISBN $$x_1x_2...x_{10}$$ can be computed from the congruence $$x_{10}\equiv\sum_{i=1}^{9}ix_i\mod11$$." I have no clue what it is asking me to do. Is it asking me to give a specific example?
Mathematics

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