Step 1: Understanding the Colours of the Rainbow.
A rainbow consists of seven distinct colours: red, orange, yellow, green, blue, indigo, and violet. These colours appear when sunlight is refracted, dispersed, and reflected by water droplets.
Step 2: Verifying the Options.
- Option (1): There are not 4 colours in a rainbow.
- Option (2): There are not 5 colours in a rainbow.
- Option (3): The correct number of colours in a rainbow is 7.
- Option (4): There are not 6 colours in a rainbow.
Conclusion:
Therefore, the correct answer is (3) 7.