Question

Which of the following is the rule for the geometric sequence 1, 3, 9, 27, . . .?

Answer 1

D

Explanation:

Answer 2

`a(n) = 1 * {3}^(n - 1)`

Explanation:

• We started at 1
• And it seems that index after index it multiplies by 3
• The formula for the geometric sequence defined implicitly is a(n) =a(1)r^(n-1)

`a(n) = a(1) {r}^(n - 1) \\ a(n) = 1 * {3}^(n - 1)`