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Evaluate \(\frac{8^{\frac{1}{3}} \times 5^{\frac{2}{3}}}{10^{\frac{2}{3}}}\) 

Mathematics
JAMB 1988

Evaluate \(\frac{8^{\frac{1}{3}} \times 5^{\frac{2}{3}}}{10^{\frac{2}{3}}}\) 

  • A. \(\frac{2}{5}\)
  • B. \(\frac{5}{3}\)
  • C. 3\(\sqrt{5}\)
  • D. 3\(\sqrt{2}\)
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Correct Answer: Option D
Explanation

\(\frac{8^{\frac{1}{3}} \times 5^{\frac{2}{3}}}{10^{\frac{2}{3}}}\)  = \(\frac{(2^3)^{\frac{1}{3}} \times 5^{\frac{2}{3}}}{(2 \times 5)^{\frac{2}{3}}}\)

= \(\frac{2 \times 5^{\frac{2}{3}}}{2^{\frac{2}{3}} \times 5^{\frac{2}{3}}}\)

= \(2^{1 - \frac{2}{3}}\) x \(5^{\frac{2}{3} - \frac{2}{3}}\)

= \(2^{\frac{1}{3}}\) x \(5^0\)

= \(\sqrt[3]{2}\)


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