Question

quantos termos tem a PA (10,12,_ _ _ _ _ _,200)?

Answer 1

An = A1 + (n-1) . r
200 = 10 + (n-1) . 2
200 = 10 + 2n - 2
2n = 200 - 10 + 2
2n = 192
n = 192 / 2
n = 96 termos