Math, asked by Kanchanthakur86, 10 months ago

3 Find the sum of the first 15 multiples of 8.

Answers

Answered by sakshi6238

1

Step-by-step explanation:

1,3,5,15 is the sum of 15

Answered by viji18net

0

Answer:

a = 8

n = 15

d = 8

So,Sn = n/2 [2a +(n-1)d)

= 15/2 (2×8 + (14)8]

= 15/2 [16 +112]

= 15/2 [128]

= 15 [64]

= 96

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