Answer:
2/7
Explanation:
1. You have to find the probability that a boy will be picked three diferent times
2. # of boys/total #of students
3. 5/7
4. Now that one boy is picked, there is only a total of 6 students left and only four boys so your proportions change
5. 4/6
6. Now there is only 5 students left and 3 boys left
7. 3/5
8. Multiply these proportions together
9. 5/7 times 4/6 times 3/5 = 2/7