\(3^{21}=\left(3^2\right)^{10}\cdot3=9^{10}\cdot3\)
\(2^{31}=\left(2^3\right)^{10}\cdot2=8^{10}\cdot2\)
=>\(9^{10}\cdot3>8^{10}\cdot2\)
=>321>231
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