-100-99-98-…-2-1-0+1+2+3+…+97+98+99 By Admin ReiPosted on December 6, 2022 -100-99-98-…-2-1-0+1+2+3+…+97+98+99 100/2 x (-101) + 50/2 x 51 = -5050 + 1275 = -3775