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NCERT Class 11 Mathematics Solutions: Chapter 9 – Sequences and Series Exercise 9.2 Part 1

Illustration: NCERT Class 11 Mathematics Solutions: Chapter 9 – Sequences and Series Exercise 9.2 Part 1

1. Find the sum of odd integers from to

Answer:

The odd integers from are .

This sequence forms an A. P.

So, first term,

Common difference,

The sum of odd integers from 1 to 2001 is,

So, the sum of odd numbers from is 1002001.

2. Find the sum of all natural numbers lying between , which are multiples of .

Answer:

The natural numbers lying between , which are multiples of are .

Here

So, the sum of all natural numbers lying between , which are multiples of .