AP Radicals Sum

If a₁, a₂, ... are in A.P., then, $\frac{1}{\sqrt{a_{1}} + \sqrt{a_{2}}}$ + $\frac{1}{\sqrt{a_{2}} + \sqrt{a_{3}}}$ + ... + $\frac{1}{\sqrt{a_{n}} + \sqrt{a_{n + 1}}}$ is equal to

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