What are the four colours of the spectrum of white light which have a wavelength longer than blue light?
Green, Yellow, Orange, Violet
Green, Yellow, Indigo, Red
Green, Yellow, Orange, Red
Green, Yellow, Indigo, Orange
The elements of sets A , B and C are all colours as follows:
A = { Red , Orange , Yellow , Brown } ,
B = { Blue , Yellow , Green , Brown } ,
C = { Black , Brown , White , Grey }
Then, A U B U C is