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JEE Mains · Maths · STD 11 - 12. limits

माना \(\mathrm{a}_1, \mathrm{a}_2, \mathrm{a}_3 \ldots \mathrm{a}_{\mathrm{n}}\) समांतर श्रेणी के धनात्मक क्रमागत \(n\) पद हैं। यदि सार्वन्तर \(d>0\) है, तब \(\lim _{n \rightarrow \infty} \sqrt{\frac{d}{n}}\left(\frac{1}{\sqrt{a_1}+\sqrt{a_2}}+\frac{1}{\sqrt{a_2}+\sqrt{a_3}}+\ldots \ldots . .+\frac{1}{\sqrt{a_{n-1}}+\sqrt{a_n}}\right)\) का मान है

  1. A \(1\)
  2. B \(\sqrt{ d }\)
  3. C \(\frac{1}{\sqrt{ d }}\)
  4. D \(0\)
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Correct Answer

(A) \(1\)

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\(\lim _{n \rightarrow \infty} \sqrt{\frac{ d }{ n }}\left(\frac{1}{\sqrt{a_1}+\sqrt{a_2}}+\frac{1}{\sqrt{a_2}+\sqrt{a_3}}+\ldots \ldots \ldots+\frac{1}{\sqrt{a_{n-1}}+\sqrt{a_n}}\right)\) On rationalising each term…
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