The answer is C. The program prints:
45
Why?
Python works from the inside out. First triple(5) returns 15. Then that answer goes into triple again, which returns 45.
Trace table
A trace table follows the program step by step. Here’s this one:
| step | value |
|---|---|
| triple(5) | 15 |
| triple(15) | 45 |
The code again
def triple(number):
return number * 3
print(triple(triple(5)))Try it: change one number in the program and predict the new output before you run it.