Correct Answer - Option 2 : Red is a colour or blue is a colour
Given statement:
It is not true that both red and blue are colours.
According to the given statement, it is clear that either red or blue are colours because both red and blue are colours is not true.
1) Red is a colour and blue is a colour → False as it is given that both red and blue are colours is not true.
2) Red is a colour or blue is a colour → The word 'or' clearly implies that either red or blue colours, because both red and blue are colours, is not true.
3) Red is not a colour and blue is a colour → False as it is given that either red or blue are colours because both red and blue are colours is not true.
4) Red a colour and blue is not a colour → False as it is given that either red or blue colours, because both red and blue are colours, is not true.
Hence, 'option 2' is the correct answer.