Question

What is the explicit formula for this geometric sequence

Answer 1

a(n) = a(1)*(1/4)^(n - 1)

Explanation:

The first four terms of this sequence are 64, 16, 4, 1.

Let the common ratio be r. Then 64r = 16, and r = 1/4.

The first term is 64.

The general term is then

a(n) = a(1)*(1/4)^(n - 1)