Question

calcule a soma dos 100 primeiros termos da pa(26,31,36,...)

Answer 1

A1 = 26 r = 5 A100 = A1 + 99r A100 = 26 + 99 . 5 A100 = 26 + 495 A100 = 521 Sn = (A1 + An).n/2 S100 = (26 + 521).100/2 S100 = 547 . 100/2 S100 = 54700/2 S100 = 27350