Question
Consider the following Python code: Â Â def
mystery(a, b):     if a == 0:       return b     else:       return mystery(b % a, a)   print(mystery(15, 20))   What is the output of this code?Solution
This is the Euclidean algorithm for finding the Greatest Common Divisor (GCD). Â Â 1. mystery(15, 20): a is not 0. Calls mystery(20 % 15, 15) which is mystery(5, 15). Â Â 2. mystery(5, 15): a is not 0. Calls mystery(15 % 5, 5) which is mystery(0, 5). Â Â 3. mystery(0, 5): a is 0. Returns b, which is 5. Â Â The final output is 5.
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