\(8^{15}=\left(2^3\right)^{15}=2^{3.15}=2^{45}\)
\(4^{20}=\left(2^2\right)^{20}=2^{2.20}=2^{40}\)
Do \(2^{45}>2^{40}\Rightarrow8^{15}>4^{20}\)
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