When you add one odd number and one even number, the sum is always an odd number. This is because the odd number has a remainder of 1 when divided by 2, while the even number has a remainder of 0. When you add them together, the remainder becomes 1, which means the result is odd.
For example:
- \(3\) (odd) + \(4\) (even) = \(7\) (odd)
- \(5\) (odd) + \(2\) (even) = \(7\) (odd)
So, the sum of one odd number and one even number is always odd.