Let \( A=\{1,2,3\} \). Then number of equivalence relations contain...

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Let \( A=\{1,2,3\} \). Then number of equivalence relations containing \( (1,2) \) is:
\[
\begin{array}{l}
1 \\
3
\end{array}
\]
\[
2
\]
\[
4 .
\]
\( \mathrm{P} \)
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