Respostas

2014-01-03T10:16:18-02:00
S = 3 + 3 + 3 + ....3^500/3^499
2 a 500 = 500 - 2 + 1 (termos) = 499 termos
3 x 499 = 1497
1 + 4 + 9 + 7 =
5 + 9 + 7 =
14 + 7 = 21