Question

Given the geometric sequence where a1=3 and the common ratio is -1, what is the domain for n?

All integers where >_0
all integers where n>_0
all integers where n<_0
all integers where n>_1​

Answer 1

all integers where n ≥ 1

Explanation:

n is a counting number, since it counts the terms of the sequence. It is in the set {1, 2, 3, ...}, any of the integers 1 or greater.