Find the sum of
a] first 10 multiples of 8
b] first 25 multiples of 3
c] first 100 multiples of 2.

Answer

a] `=5 [16+ 72] = 5 xx 88 = 440`.
b] `= (25)/(2) [ 6 + 72] = (25)/(2) xx 78 = 975`.
c] `= 50[ 4+198] = 50 xx 202 = 10100.`