what is the difference of the first 25 multiples of 3, subtracted from the first 25 multiples of 4
Notice the pattern......
(4-3) +( 8-6) + (12-9) + (16-12)+..........+ (96-72) + (100-75) =
1 + 2 + 3 + 4 + ........+ 24 + 25 = [25 * 26] / 2 = 25 * 13 = 325