**CBSE NCERT Solutions Chapter 5 Arithmetic Progressions Exercise 5.3 Question 7**

**7. Find the sum of first 22 terms of an AP in which d = 7 and 22nd term is 149.**

**Solution:**

It is given that 22nd term is equal to 149.

It means

**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 a, we get**

**Therefore, sum of first 22 terms of AP is equal to .**