**CBSE NCERT Solutions Chapter 5 Arithmetic Progressions Exercise 5.3 Question 12**

**12. Find the sum of the first 40 positive integers divisible by 6.**

**Solution:**

The first 40 positive integers divisible by 6 are terms.

Therefore, we want to find sum of 40 terms of sequence of the form:

... 40 terms

First term = a = 6

Common difference = d = 12 - 6 = 6

**Applying formula**, to find sum of n terms of AP , **we get**