Answer: (1) 2/9 (2) 1/3 (3) 4/9
n(S) = 2 + 3 + 4 = 9
(1) \( P(\text{red}) = \frac{2}{9} \)
(2) \( P(\text{blue}) = \frac{3}{9} = \frac{1}{3} \)
(3) \( P(\text{green}) = \frac{4}{9} \)
Check: \( \frac{2}{9} + \frac{3}{9} + \frac{4}{9} = 1 \).
Note: the textbook answer key prints 4/9 for part (1); with 2 red balloons out of 9, the probability is 2/9.