There are only white eggs and brown eggs in a box.
The number of white eggs is three times the number of brown eggs.
Rick takes at random one egg from the box.
He records the colour of the egg and then replaces it in the box.
Rick does this n times, where n ≥2
Write down an expression. in terms of n, for the probability that Rick gets a white eg
least once and a brown egg at least once.
