1. Which formula defines the sequence f(1) = 2, f(2)= 6, f(3) = 10, ƒ(4) = 14,
f(5) = 18?
A. f(1) = 2, f(n) = 6 + f(n-1) for n ≥ 2
B. f(1) = 2, f(n) = 4+ f(n-1) for n ≥ 2
C. ƒ(1) = 2, ƒ(n) = 2 + ƒ(n − 1) for n ≥ 2
D. ƒ(1) = 6, ƒ(n) = 4 + ƒ(n − 1) for n ≥2