Given the geometric sequence where a1 = 4 and the common ratio is 3, what is the domain for n?

all integers where n ≥ 1

all integers where > 1

all integers where n ≥ 4

all real numbers
for this its always greater than one right? for every type of these things?

also given the arithmetic sequence an = 4 − 3(n − 1), what is the domain for n?

all integers where n ≥ 1

all integers where n > 1

all integers where n ≤ 4

all integers where n ≥ 4