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# RD Sharma Class 11 Maths Solutions Chapter 21 - Some Special Series

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## RD Sharma Solutions for Class 11 Maths Chapter 21 - Free PDF Download

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RD Sharma Class 11 Some Special Series, cover the sums of the first â€˜nâ€™ natural numbers, squares of first â€˜nâ€™ natural numbers, and cubes of the first â€˜nâ€™ natural numbers. Students can refer to the RD Sharma Solutions For Class 11 Maths Chapter 21 PDF to get a clear idea of the concept of the special series. The solutions are prepared by our expert faculty team in a comprehensive manner to make it interesting for students to solve. These Solutions are available in PDF format on Vedantu and can be downloaded for free of cost.

Concepts covered in this chapter are the sum to â€˜nâ€™ terms of some other special series viz. series of natural numbers, series of the square of natural numbers, series of cubes of natural numbers, etc. RD Sharma Solutions are designed for CBSE students, according to the latest syllabus prescribed by the CBSE Board. Our expert teacher has designed these solutions in an easily understandable language. To practice is an essential task to learn and score well in Mathematics. The pdfs of RD Sharma Solutions For Class 11 Maths Chapter 21 are provided here. Students are advised to go through RD Sharma Solutions thoroughly before the final exams to score well in the exam.

FAQ (Frequently Asked Questions)

1. What is the formula for the sum of the square of first N natural numbers?

The sum of the square of the first N natural number can be calculated using the following formula-

( n(n+1)(2n+1) /6)

2. What is an AGP series?

The Arithmetic-Geometric Progression (AGP) is a sequence of which each term can be expressed as the product of an arithmetic progression and a geometric progression. The general form of an AGP is-Â Â Â Â Â Â Â

a, (a+d)r,Â  (a+2d)r2,Â  (a+3d)r3, (a+4d)r4, â€¦â€¦â€¦.. (a+(n-1)d)rn-1

Here, â€˜aâ€™ is the first term, â€˜dâ€™ is a common difference and â€˜râ€™ is the common ratio.

3. How can we determine nth term of an arithmetic sequence?

Given an arithmetic sequence with the first term a1 and the common difference d, thenÂ  the nth (or general) term is determined by an=a1+(n-1)d