# Question #45f47

##### 1 Answer

Feb 28, 2017

It is impossible. See explanation.

#### Explanation:

The formal proof could look like:

Let the odd numbers be:

The sum would be:

The las experssion is an even number plus 1, so it is an odd number.

Informally you could say that:

The sum of an even number of odd numbers is always even, but the sum of odd number of odd numbers is always odd