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$8^{3 \log _{8} 5}$ is equal to
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125
$8^{3 \log _{8} 5} \Rightarrow 8^{\log _{8} 5^{3}}=(5)^{3} \quad\left[a^{\log _{a} x}=x\right]$ $=5 \times 5 \times 5=125$
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