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Let $\mathrm{f}=\{(1,2),(3,5),(4,1)$ and $\mathrm{g}=\{(2,3),(5,1),(1,3)\}$. Then $g \circ \mathrm{f}=$ and $f \circ g=$
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gof $=\{(1,3),(3,1),(4,3)\}$ and fog $=\{(2,5),(5,2),(1,5)\}$
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