f1(x)f1(x) = 2x - 1 and fn(x)=f1(fn−1(x))fn(x)=f1(fn−1(x)) for n ≥≥ 2. Find f5(2)
Choices.
A) 7  B) 6  C) 78  D) 9  E) 1

Rationale: answer : a
Answer: A