Pls help this is really important

Question

Which function describes the sequence 3, 6, 12, 24, … for n = 1, 2, 3, …?

1. A. f(n) = 3n

1. B. f(n) = 3 ∙ 2^n-1

1. C. f(n) = 2ⁿ + 1

1. D. f(n) = (n - 1)² + 3

Answer 1

B) 3(2)^(n-1)

general formula for a term in a geometric sequence is an= a1r^(n-1) in this sequence a1 = 3 and r=2