Congruence Modulo \(n\).

We say \(a\) is congruent to \(b\) modulo \(n\), and write,

\begin{equation*} a \equiv b \pmod{n} \end{equation*}

provided \(a\) and \(b\) have the same remainder when divided by \(n\text{.}\) In other words, provided \(a\) and \(b\) belong to the same remainder class modulo \(n\text{.}\)

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