Question

2) o vigesimo quarto da PA (3,8,...) é: a) 57 b) 64 c) 95 d) 98 e) nenhum

Answer 1

a1 = 3
a2 = 8
r = 8 - 3 = 5 ****
n = 24
a1 + 23r = 3 + 23 ( 5)  = 3 + 115 = 118 ****  ( e )
prova
PA{3.8,13,18,23,28,33,38,43,48,53,58,63,68,73,78,83,88,93,98,103,       108,113,118}