Question

find the sum of first 8 multiples of 3

Answer 1

first 8 multiples of 3 are 3,6,9,12,15,18,21 and 24
so sum of these nos is 108
hope it helps you

Answer 2

you can find this by the formulla n/2(2a+(n-1)d). answer would be 108.
hope you understand..