$\sqrt{15625}$ equals

$\sqrt{15625}$ equals
  1. $125$
  2. $105$
  3. $135$
  4. $115$

Solution

$125 \times 125 = 15625$. (Check: $125^{2} = (5^{3})^{2} = 5^{6} = 15625$.)

Asked in: IMO

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