Concept
Are the numbers 18 and 25 congruent mod 6?
Stephen Davies, Ph.D. Version 2.2.2 Through Discrete Mathematics A Cool Brisk Walk / Chapter 1
"the numbers 18 and 25 con- gruent mod 6? No. If we take groups of 6 out of 18 stones, we’ll get three such groups with nothing left over. But if we start with 25 stones, we’ll take out 4 such groups (for a total of 24 stones) and have one left over. So they’re not congruent mod 6."
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