Casting out nines: Difference between revisions
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;Part 1
Write a procedure (say <math>\mathit{co9}(x)</math>) which implements [https://web.archive.org/web/20120619091249/http://mathforum.org/library/drmath/view/55926.html Casting Out Nines] as described by returning the checksum for <math>x</math>. Demonstrate the procedure using the examples given there, or others you may consider lucky.
;Part 2
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