NCERT Solution Class X Mathematics Arithmetic Progressions Question 13 (Ex 5.3)

Question 13:

Find the sum of first 15 multiples of 8.

Answer:

The multiples of 8 are 8, 16, 24, 32…

These are in an A.P., having first term as 8 and common difference as 8.

Therefore, a = 8

d = 8

S15 =?

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