Question

six students of a form five class were selected for national service. if a student is picked at random at the class, the probability that the student is not one of those selected for national service is 6/7.how many students ents were there in the class​

Answer 1

Total no of students = x

No of students in national service=6

P(student not in national service)= x-6/x

x-6/x=6/7

7x-42=6x

x=42

Thus there were 42 students...

Hope this helps.......