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Ordered Pair

☼ Ordered Pair : A pair of two elements a and b listed in a specific order, is called an ordered pair ( a, b ).

Note (i) ( 2, 3 ) $\ne$ ( 3, 2 ), while { 2, 3 } = { 3, 2 }

(ii) $\left (x_{1},y_{1} \right ) = \left (x_{2},y_{2} \right )$ $\large \Leftrightarrow$ $x_{1} = x_{2}$ & $y_{1}=y_{2}$ .