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1. $(5^{4} \times 8 \times 16) / (2^{5} \times 125)$

Answer: Option A

Explanation:

\frac{5^{4} \times 8 \times 16}{2^{5 \times} 125} = \frac{5^{4} \times 2^{3} \times 2^{4}}{2^{5} \times 5^{3}} = \frac{5^{4} \times 2^{3 + 4}}{2^{5} \times 5^{3}} = 5^{4 - 3} \times 2^{7 - 5} = 5^{1} \times 2^{2} = 5 \times 4 = 20

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