A deck of cards contains a white card and two red cards. Take one card out randomly, record its colour, and put it back in the deck. Then, take another card out randomly.  Compare the probability of the following situations.  I. Both cards are of the same colour.  II. Both cards are red.  III. Two cards are of different colours.  Which one has the highest probability? 
Overseas Competition->Knowledge Point->Counting Modules->Statistics and Probability->Questions Involving Probability->Basic Concepts of Probability
I. Both cards are in the same colour: $$ \dfrac{5}{9}$$;  II. Both cards are red: $$\dfrac{4}{9}$$;  III. Two cards are in different colours: $$\dfrac{4}{9}$$. 