How many times is the fib method in Listing 18.2 invoked for fib(5)?
a. 14
b. 15
c. 25
d. 31
e. 32
b. 15
Hint: number of time fib is invoked in fib(5) = 1 + number of time fib is invoked in fib(3) + number of time fib is invoked in fib(4) = 1 + 5 + 9 = 15
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