Dakari adds a card to each set he made for question 4. Now there are four cards in each set, with the letters A, B,C and D.
Again, Dakari give two people a full set of cards each and asks them to take one card.
a. Draw a sample space diagram to show all the possible results with four cards.
b. Find the probability that:
i. both picks the same letter.
ii. each picks a different letter.