[填空题]
A lego storage box is left with 4 blue andle+d* 4lz 5ngp 7 red bricks. Maxduy/72xb 9 lh3zzql tsc)*ck 8 takes a brick from the box at random and attaches it to his new castle. He then chooses another brick 9cyqk z 82*)hls/cl3t7 d ubxzfron the same box at random.
1.Complete the following tree diagram.
2.Calculate the probability that both bricks chosen by Max are of the same color.≈
