$(2 \sqrt{392} - 21) + (\sqrt{8} - 7)^{2} = (?)^{2}$

  • A
    $5$
  • B
    $6$
  • C
    $7$
  • D
    $8$

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$(\sqrt{9})^{3} \times (\sqrt{81})^{5} \div 27^{2} = 3^{?}$

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એક ધન સંખ્યાનો બે-તૃતીયાંશ ભાગ અને તેના વ્યસ્તનો $\frac{25}{216}$ ભાગ સમાન છે. તો તે સંખ્યા શોધો.

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