Question

WILL GIVE BRAINLIEST!!!!!!!!-What is the recursive rule for this geometric sequence?

7, 21, 63, 189, …



a1=7;an=3⋅an−1

a1=21;an=7⋅an−1

a1=3;an=7⋅an−1

a1=7;an=13⋅an−1

Answer 1

I just learned this, I believe that the answer is a1=21;an=7⋅an−1

Answer 2

The correct answer, i took the test was: a1 =7;an =3⋅an−1