NCERT Class 11 Mathematics Solutions: Chapter 9 –Sequences and Series Miscellaneous Exercise 9 Part 12

Glide to success with Doorsteptutor material for IMO : fully solved questions with step-by-step explanation- practice your way to success.

Download PDF of This Page (Size: 316K)

Formulae for Arithmetic Series

Formulae for Arithmetic Series

1. Find the 20th term of the series terms.


The given series is terms


So, the term of the series is .

2. Find the sum of the first n terms of the series:


The given series is

On subtracting both the equations, we obtain

Developed by: