[ [ Evenness and Oddness ]

What do you think will be the sum - even or odd - of: a) an even number of even numbers; b) an even number of odd numbers; c) an odd number of even numbers; d) an odd number of odd numbers?
The sum of any number of even numbers, as well as an even number of odd numbers, will be even, while the sum of an odd number of odd numbers will be odd.

## Answer

a) even; b) even; c) even; d) odd.