#### Return the sum of all even numbers in a list.

This problem asks the user to return the sum of all the even numbers in a list. An example input would be [1, 2, 3, 4, 5], and the corresponding output would be 6.

#### Problem

```Given a list of numbers, return the sum of all the even numbers in the list.
Example input: [1, 2, 3, 4, 5]
Example output: 6```

#### Solution

This solution is in Python. Our A.I. can create solutions in multiple languages.
```def sum_even(numbers):
return sum(n for n in numbers if n % 2 == 0)

# This solution is optimal because it uses a generator expression to filter the list of numbers,
# and then uses the built-in sum function to sum the filtered list.
# This solution is O(n) because it iterates over the list once.```

A.I. Evaluation of the Solution

This solution is correct and demonstrates a good understanding of how to filter and sum a list of numbers. The approach is efficient and uses built-in functions to minimize the amount of code needed.

Evaluated at: 2022-11-20 08:16:05