Question

how do i find r in a geometric sequence of (243, 81, 27)? also how do i find the explicit formula for this?

Answer 1

Explanation:

The initial term is 243. Since it is a geometric sequence, each term is r times the preceding term.

r = 81/243 = ⅓

nth term = a₁rⁿ⁻¹ = 243(⅓)ⁿ⁻¹