
Consider the following “justification” that the Fibonacci function, F(n) is O(n): Base case (n ≤ 2): F(1) = 1 and F(2) = 2.
Induction step (n > 2): Assume claim true for n′ < n. Consider n. F(n) = F(n − 2) + F(n − 1). By induction, F(n − 2) is O(n − 2) and F(n − 1) is O(n − 1). Then, F(n) is O((n − 2) + (n − 1)), by the identity presented in Exercise R-4.16.
Therefore, F(n) is O(n).
What is wrong with this “justification”?

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