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Complete residue system

From AoPSWiki

A Complete residue system modulo n is a set of integers which satisfy the following condition: Every integer is congruent to a unique member of the set modulo n.

In other words, the set contains exactly one member of each residue class.

Examples

\{1,2,3\}, \{4,5,6\}, and \{9,17,85\} are all Complete residue systems \pmod{3}.

\{k,k+1,k+2,k+3,\ldots,k+m-1\} is a complete residue system \pmod{m}, for any integer k and positive integer m. Basically, any consecutive string of m integers forms a complete residue system \pmod{m}.

Want to learn how to tackle those tough AMC/AIME/Olympiad algebra problems? Check out Art of Problem Solving's Intermediate Algebra by Richard Rusczyk and Mathew Crawford. Over 1600 problems!
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