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Lim N → ∞ [ ( N + 2 ) ! + ( N + 1 ) ! ( N + 2 ) ! − ( N + 1 ) ! ]

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Question

\[\lim_{n \to \infty} \left[ \frac{\left( n + 2 \right)! + \left( n + 1 \right)!}{\left( n + 2 \right)! - \left( n + 1 \right)!} \right]\] 

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Solution

\[\lim_{n \to \infty} \left[ \frac{\left( n + 2 \right)! + \left( n + 1 \right)!}{\left( n + 2 \right)! - \left( n + 1 \right)!} \right]\]
\[ = \lim_{n \to \infty} \left[ \frac{\left( n + 2 \right) \left( n + 1 \right)! + \left( n + 1 \right)!}{\left( n + 2 \right) \left( n + 1 \right)! - \left( n + 1 \right)!} \right]\]
\[ = \lim_{n \to \infty} \left[ \frac{\left( n + 1 \right)!}{\left( n + 1 \right)!} \times \frac{\left( n + 2 + 1 \right)}{\left( n + 2 - 1 \right)} \right]\]
\[ = \lim_{n \to \infty} \left[ \frac{n + 3}{n + 1} \right]\]

Dividing the numerator and the denominator by n: 

\[\lim_{n \to \infty} \left[ \frac{1 + \frac{3}{n}}{1 + \frac{1}{n}} \right] \]
\[\text{ When n } \to \infty , \text{ then } \frac{1}{n} \to 0 . \]
\[ \Rightarrow \frac{1}{1} = 1\] 

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Chapter 29: Limits - Exercise 29.6 [Page 39]

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R.D. Sharma Mathematics [English] Class 11
Chapter 29 Limits
Exercise 29.6 | Q 11 | Page 39

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