$\sqrt{0.81} \times \sqrt{0.49}$ equals

$\sqrt{0.81} \times \sqrt{0.49}$ equals
  1. $0.63$
  2. $0.36$
  3. $6.3$
  4. $0.063$

Solution

$\sqrt{0.81} = 0.9$, $\sqrt{0.49} = 0.7$. Product $= 0.63$.

Asked in: IMO

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