CBSE NCERT Solutions Chapter 5 Arithmetic Progressions Exercise 5.3 Question 6
6. The first and the last terms of an AP are 17 and 350 respectively. If, the common difference is 9, how many terms are there and what is their sum?
First term =
Last term =
Common difference =
Using formula , to find nth term of arithmetic progression, we can say that
Applying formula, to find sum of n terms of AP and putting value of n, we get
Therefore, there are 38 terms and their sum is equal to 6973.