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Sum n numbers

Level: Beginner (score: 2)

Write a Python function that calculates the sum of a list of (int) numbers:

• The function should accept a list of numbers and return the sum of those numbers.
• If no argument is provided (that is, numbers is None), return the sum of the numbers 1 to 100 (Note that this is not the same as an empty list of numbers being passed in. In that case the sum returned will be 0).

Have fun!