Question

find the sum of first 15 multiples of 8​

Answer 1

Answer:

Step-by-step explanation:

THE SUM=8+16+24+..120

IS THE ANSWER=960

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Answer 2

Answer:

960

Step-by-step explanation:

first four multiples of 8 =8,16,24,32,40

ap=8,16,24,32,40..........120

first term(a)=8, common difference(d)=8

number of terms(n)=15,last term(l)=120

=n/2(a+l)

=15/2(8+120)

=15/2(128)

=15*64

=960

hence, 960 is the sum of first 15 multiples of 8

i hope it will be helpful to you