Question

What is the explicit formula for this geometric sequence 64, 16, 4, 1

Answer 1

a(n) = 64 * (1/4)^(n-1)

Explanation:

64/16 = 4

16/4 = 4

and so on

so r = 1/4

Geometric sequence:

a(n) = a1 r^(n-1)

a(n) = 64 * (1/4)^(n-1)