What is the sum of the numbers 1, 2, and 3?

The sum of the numbers 1, 2, and 3 is determined by adding them together. When you add 1 and 2, you get 3. Then, by adding 3 to that result, you arrive at 6 (3 + 3 = 6). This total represents the correct answer to the question.

The calculations clearly show that combining these three numbers results in 6, which aligns with basic arithmetic principles. By following the standard process of addition, you ensure that each number contributes correctly to the final sum.