Practice Test Discussion

${(?)}^{3} = 729$

[BOI (PO), 2009]

None of these

Explanation

$\begin{array}{l} Here, \\ \Rightarrow {(?)}^{3} = 729 \Rightarrow {(?)}^{3} = 9 \times 9 \times 9 \\ \Rightarrow ? = 9 [taking cube root on both sides] \end{array}$

Hence, Option E is correct.

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