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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 .