Question

find the sum of the first 15 multiples of 8​

Answer 1

Answer:

the answer is 960

I HOPE THIS WILL HELP YOU MATE

Answer 2

Answer:

Step-by-step explanation:

here the multiples of 8 is 8,16,24,32......

the multiples of 8 is in AP

therefore n=15, a=8, d=8

sn=n/2[2a+(n-1)d]

sn=15/2[2×8+(15-1)8]

sn=15/2[16+(14)8]

sn=15/2[16+112]

sn=15/2[128]

sn=15×64

sn=960

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