thakur1 thakur1

11-09-2022
Mathematics

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find the sum of first 15 multiples of 8

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djp6182583 djp6182583

11-09-2022

Answer:
960.
Step-by-step explanation:
That is 8 + 2(8) + 3(8) + ........ + 15*8
This is an arithmetic series with first term 8 and common difference 8.
Number of terms = 15.
Sum of n terms
= (n/2)[2a1 + d(n-1)]
So, sum of 15 terms
= (15/2)[2*8 + 8(15-1)]
= 7.5 * 120
= 960.

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