Step 1: Understanding Secondary Colours.
Secondary colours are created by mixing two primary colours. The primary colours are red, yellow, and blue. By mixing any two of these primary colours, we can obtain the following secondary colours:
- Red + Yellow = Orange
- Yellow + Blue = Green
- Blue + Red = Purple
Step 2: Identifying the Secondary Colour.
Among the given options:
- Red is a primary colour, not a secondary one.
- Orange is a secondary colour because it is formed by mixing red and yellow.
- Yellow is a primary colour.
- Blue is a primary colour.
Conclusion:
Therefore, the correct answer is (2) Orange, as it is the secondary colour formed by mixing red and yellow.