CBSE NCERT Solutions Chapter 5 Arithmetic Progressions Exercise 5.3 Question 13
13. Find the sum of the first 15 multiples of 8.
Solution:
The first 15 multiples of 8 are
15 times
First term = a = 8
Common difference = d = 16 – 8 = 8
n = 15
Applying formula,
to find sum of n terms of AP , we get
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