A sequence is defined by f(1) =3 and f(n) =2 x f(n-1) for n > 1. Which of the following statements defines the nth term of f. a. f(n) = 3 x 2n for n > 1
b. f(n) = 3 x 2n-1 for n > 1
c. f(n) = 3 + 2(n-1) for n > 1
d. f(n) = 3 + 2n for n > 1