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CAT

Algebra

Hard

$\frac{n-1}{\sqrt{a_{1}}+\sqrt{a_{n}}}$

$\frac{\mathrm{n}}{\sqrt{\mathrm{a}_{1}}-\sqrt{\mathrm{a}_{\mathrm{a}+1}}}$

$\frac{n-1}{\sqrt{a_{1}}+\sqrt{a_{2-1}}}$

$\frac{n}{\sqrt{a_{1}}+\sqrt{a_{n+1}}}$

✅ Correct Option: 4

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