Step-by-step explanation:
Given;
We are given that in a class there are the following groups of students;

Required;
We are required to calculate the probability that a student selected at random will have Green eyes OR Blue eyes.
Step-by-step solution;
To calculate the probability of an event, we shall use the following formula;
![P[Event]=\frac{Number\text{ }of\text{ }required\text{ }outcomes}{Number\text{ }of\text{ }all\text{ }possible\text{ }outcomes}](https://img.qammunity.org/2023/formulas/mathematics/college/o5uje0km92fgz2wuaiigntlf443eu307t9.png)
To calculate the probability that a selected student will have green eyes;
![P[green]=(6)/(20)=(3)/(10)](https://img.qammunity.org/2023/formulas/mathematics/college/plzc38tn7ttx51aeqhpg91jmyz8p50g6dr.png)
To calculate the probability that a selected student will have blue eyes;
![P[blue]=(5)/(20)=(1)/(4)](https://img.qammunity.org/2023/formulas/mathematics/college/hcbm49ud4svolx7jiu2af998jmhtxn2sdc.png)
The probability of event A or event B will be the addition of probabilities.
Therefore, the probability that a randomly selected student will have green or blue eyes will be;
![P[G]+P[B]=(3)/(10)+(1)/(4)](https://img.qammunity.org/2023/formulas/mathematics/college/lw4ejerdkhr2d9k6111w0rqdpiyuddbz3t.png)
![P[F]+P[B]=(6)/(20)+(5)/(20)=(11)/(20)](https://img.qammunity.org/2023/formulas/mathematics/college/wsbr3jdvqi7f8cs2df5givch9h14s1hs8x.png)
Therefore,
ANSWER:
![P[G\text{ }orB]=(11)/(20)](https://img.qammunity.org/2023/formulas/mathematics/college/rkosp0elgsiiuo9lbavp7xioj95fcn5ava.png)