Question

determine o termo que ocupa o 40 lugar na PA em que a1=2 e r=2

Answer 1

an = a1 + (n - 1) . r → a40 = 2 + (40 - 1) . 2 → a40 = 2 + 39 . 2 →
a40 = 2 + 78 → a40 = 80

P.A. (2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80)