Question

Find the sum of the 15 multiples of 8

Answer 1

HEY MATE HERE IS YOUR ANSWER

THE FIRST 15 MULTIPLES OF 8 ARE

8,16,24,32,40,48,56,64,72

Since the difference is same so it is AP

We need to find the sum of 15 MULTIPLES use this formula
${s}^{n} = \frac{n}{2} (2a + (n - 1)d)$
HERE N= 15,A =8 & D=16-8=8

15/2(2*8+(15-1)*8)
15/2(16+14*8)
15/2)16+122
15/2*128
960

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Answer 2

8+16+24+32+40+48+56+64+72+80+88+96+104+112+120=960....
Hope it's helpful