Question

Find the sum of first 15 multiplies of 8

Answer 1

960 is the answer.

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Answer 2

$\huge\bf\red{\mid{\overline{\underline{ANSWER}}}\mid}$

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

=15/2(2×8+(15-1)8)

=15(8+7×8)

=15(8+56)

=15(64)

=$\boxed{960}$

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