Answer:
4/35
Step-by-step explanation:
The probability that the teacher will choose someone who has not done his homework is the number of students who have not done their homework divided by the total number of students: 4/7
So, the probability that the teacher picks a second student who also has not done his homework is 3/6
So, the probability of the teacher picking 3 students such that none of them have done their homework is 4/7×3/6×2/5=24/210=4/35
Hope this helps.
