Răspuns :
2 + 4 + 6 + ....... + 2018 =
2(1 + 2 + 3 + .... + 1009) =
2 * 1009 * (1009 + 1)/2 =
2 * 1009 * 1010/2 =
2 * 1009 * 505 =
1019090
2(1 + 2 + 3 + .... + 1009) =
2 * 1009 * (1009 + 1)/2 =
2 * 1009 * 1010/2 =
2 * 1009 * 505 =
1019090