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
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