Question

What are the first three terms of the sequence: a_1 = 3 and a_n = 2(_an-1)^2?

a) 2, 8, 18
b) 3, 18, 648
c) 3, 32, 50
d) 2, 6, 12, 24

What is the common ratio of the geometric sequence: 128, 16, 2, -1/4 . . . ?

Option A: -8
Option B: 8
Option C: -1/8
Option D: 1/8

Answer 1

1. a) 2,8,18

Answer 2

2. option D. 1/8 --- 128/8=16 --- 16/8=2 --- ....