Consider a box containing four balls: one red, one green, one blue, and one tricolor (=red,green and blue).
You draw one ball from the box.
Consider the three events:
R = {the drawn ball contains red}
G = {the drawn ball contains green}
Y = {the drawn ball contains red and green}
Are R and G independent? At first I thought yes, but doesn't getting a tricolor ball affect the probability of R and G?
Are G and Y independent? I think no because a tricolor ball can be in both G and Y.