p C(2，2)/C(6，2)C(2 1)C(2 1)/C(6，2) [C(2，2)+C(2 1)C(2 1)]/C(6，2)

1/ 15 4/ 15 1/3

X 5 6

p C(2， 1)C(2， 1)/C(6，2) C(2，2)/C(6，2)

4/ 15 1/ 15

EX = 2/ 15+ 12/ 15+20/ 15+20/ 15+6/ 15 = 4

(2) The two pictures are both blue, and the probability is 4c (2,2)/c (6,2) =115.

The probability that both graphs are blue c (2,3)/c (6,2) =1/5.

In the case that the two drawn cards are blue cards, find the probability that the sum of the numbers marked on the two drawn cards is equal to 4 (115)/(1/5) =1/3.