Question

For the following geometric sequence find the recursive formula.

{1, -3, 9, ...}

A.  an = -3 · an - 1 where a1 = 1

B.  an = -3 · an - 1 where a1 = -1 C.  an = -1 · (-3)n - 1 D.  an = (-3) n - 1

Answer 1

A or b is right ! Hope you get it right