[填空题]
A lego storage box is left with 4 blue and 7 red bri v s2qapef -na36kqz2:.tla4icks. Max takdu*(kv(hb qk5qg: nti4 o *ow /zg92ggu0x8l kes a brick from the box at random and attaches it to his new castle. He then chooses another brick fron the same box at randomvhk9 gqtok(0iu8*/q5bl( kxg:ogw* 2d4zn gu .
1.Complete the following tree diagram.
2.Calculate the probability that both bricks chosen by Max are of the same color.≈
