Neptune is covered with ___ clouds.
red
yellow
green
blue
Neptune, also called as Ice Giant is covered with ice clouds and methane clouds which give the blue tint.
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