Question

What is the fifth term in the geometric sequence?

1, 2, 4, 8, ...
12
16
32
64

Answer 1

16.

Explanation:

nth term = a1r^(n-1)

Here a1 = 1, n = 5 and r = 2/1 = 2.

5th term = 1 * (2)^(5-1)

= 1*2^4

= 16.