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Lim N → ∞ 1 − 2 + 3 − 4 + 5 − 6 + . . . . + ( 2 N − 1 ) − 2 N √ N 2 + 1 + √ N 2 − 1 is Equal to - Mathematics

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प्रश्न

\[\lim_{n \to \infty} \frac{1 - 2 + 3 - 4 + 5 - 6 + . . . . + \left( 2n - 1 \right) - 2n}{\sqrt{n^2 + 1} + \sqrt{n^2 - 1}}\] is equal to 

पर्याय

  • \[\frac{1}{2}\]

  • \[- \frac{1}{2}\]

  •  1

  •  −1 

MCQ
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उत्तर

\[- \frac{1}{2}\] 

\[\lim_{n \to \infty} \left[ \frac{1 - 2 + 3 - 4 + 5 - 6 + . . . \left( 2n - 1 \right) - 2n}{\sqrt{n^2 + 1} + \sqrt{n^2 - 1}} \right]\]
\[ = \lim_{n \to \infty} \left[ \frac{\left( 1 + 3 + 5 + . . . 2n - 1 \right) - \left( 2 + 4 + 6 + . . . 2n \right)}{\left( \sqrt{n^2 + 1} + \sqrt{n^2 - 1} \right)} \right]\]
\[ = \lim_{n \to \infty} \left[ \frac{\frac{n}{2}\left( 1 + 2n - 1 \right) - \frac{n}{2}\left( 2 + 2n \right)}{\left( \sqrt{n^2 + 1} + \sqrt{n^2 - 1} \right)} \right]\]
\[ = \lim_{n \to \infty} \left[ \frac{n^2 - n\left( n + 1 \right)}{\left( \sqrt{n^2 + 1} + \sqrt{n^2 - 1} \right)} \right]\]
\[ = \lim_{n \to \infty} \left[ \frac{- n}{\left( \sqrt{n^2 + 1} + \sqrt{n^2 - 1} \right)} \right]\]

Dividing the numerator and the denominator by n

\[= \lim_{n \to \infty} \left[ \frac{- 1}{\sqrt{1 + \frac{1}{n^2}} + \sqrt{1 - \frac{1}{n^2}}} \right] \]
\[ = \frac{- 1}{1 + 1}\]
\[ = \frac{- 1}{2}\]

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पाठ 29: Limits - Exercise 29.13 [पृष्ठ ७९]

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आरडी शर्मा Mathematics [English] Class 11
पाठ 29 Limits
Exercise 29.13 | Q 23 | पृष्ठ ७९

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