[填空题]
A lego storage box is left with 4 blue and 7 red bricks. Max takes 26cqapca:;4 r 2jo3 tm u.feboa)ycpvxy1abz 6z;5q + vyxul; 9 brick from the box at random and attaches it to his new castle. c; vyx)qz6xl9+;a5vyz 1buy pHe then chooses another brick fron 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.≈
