Probability is given by:
[tex]P(A)=\frac{\text{Number of favourable outcomes}}{\text{Total number of outcomes}}[/tex]There is a total of 72 outcomes, then:
For green:
[tex]\frac{13}{72}[/tex]For red:
[tex]\frac{7}{72}[/tex]For rainbow:
[tex]\frac{3}{72}[/tex]