Find the sum of the first 15 multiples of 8?

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asked Mar 13, 2018 in Mathematics by paayal (26,720 points) 4 6 11
Find the sum of the first 15 multiples of 8?

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answered Mar 13, 2018 by sanjaydas (61,430 points) 5 7 7
edited Mar 15, 2018 by faiz
 
Best answer

Solution: a = 8, and n = 15

s15 = 15/2(16+8 x14) =15 x 64 =960

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