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If $a_{1},a_{2}\dots$ are in A.P., then, $\frac{1}{\sqrt{a_{1}}+\sqrt{a_{2}}}+\frac{1}{\sqrt{a_{2}}+\sqrt{a_{3}}}+\dots+\frac{1}{\sqrt{a_{n}}+\sqrt{a_{n+1}}}$ is equal to 

  1. $\frac{n-1}{\sqrt{a_{1}}+\sqrt{a_{n-1}}}$
  2. $\frac{n}{\sqrt{a_{1}}+\sqrt{a_{n+1}}}$
  3. $\frac{n-1}{\sqrt{a_{1}}+\sqrt{a_{n}}}$
  4. $\frac{n}{\sqrt{a_{1}}-\sqrt{a_{n+1}}}$
in Quantitative Aptitude 11.6k points 221 1489 2361
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Correct Answer: B

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