The Fibonacci sequence begins with 0 and then 1 follows. All subsequent values are the sum of the previous two, for example: 0, 1, 1, 2, 3, 5, 8, 13. Complete the fibonacci() function, which takes in an index, n, and returns the nth value in the sequence. Any negative index values should return-1. Ex: If the input is: 7 he output is: fibonacci (7) is 13 Note: Use recursion and DO NOT use any loops.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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main.py
Load default template...
1 def fibonacci(n):
2
3
4
if n<0:
return
-1"
7
elif n == 1:
return 1
elif n == 2:
10
return 1
11
else:
12
return fibonacci(n-1)+fibonacci(n-2)
13
main_":
int (input ())
14 if
name
==
15
start num =
print('fibonacci({}) is {}'.format (start_num, fibonacci(start_num)))
16
Transcribed Image Text:main.py Load default template... 1 def fibonacci(n): 2 3 4 if n<0: return -1" 7 elif n == 1: return 1 elif n == 2: 10 return 1 11 else: 12 return fibonacci(n-1)+fibonacci(n-2) 13 main_": int (input ()) 14 if name == 15 start num = print('fibonacci({}) is {}'.format (start_num, fibonacci(start_num))) 16
The Fibonacci sequence begins with 0 and then 1 follows. All subsequent values are the sum of the previous two, for example: 0, 1, 1, 2, 3,
5, 8, 13. Complete the fibonacci() function, which takes in an index, n, and returns the nth value in the sequence. Any negative index values
should return -1
Ex: If the input is:
7
the output is:
fibonacci (7) is l3
Note: Use recursion and DO NOT use any loops.
Transcribed Image Text:The Fibonacci sequence begins with 0 and then 1 follows. All subsequent values are the sum of the previous two, for example: 0, 1, 1, 2, 3, 5, 8, 13. Complete the fibonacci() function, which takes in an index, n, and returns the nth value in the sequence. Any negative index values should return -1 Ex: If the input is: 7 the output is: fibonacci (7) is l3 Note: Use recursion and DO NOT use any loops.
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