in Quantitative Aptitude recategorized by
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Find the sum of the expression

$\dfrac{1}{\sqrt{1}+\sqrt{2}}+\dfrac{1}{\sqrt{2}+\sqrt{3}}+\dfrac{1}{\sqrt{3}+\sqrt{4}}+ \dots \dots +\dfrac{1}{\sqrt{80}+\sqrt{81}}$

  1. $7$
  2. $8$
  3. $9$
  4. $10$
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