A lot of bikes are parked in front of a university.
A truck unfortunately hits 10 bikes and destroy them.
Of the students at the university: 20% are smoker, 40% are bikers, 25 % of the bikers are smokers.
What is the probability that none of the 10 bikes belongs to the smokers??
We can place the given information in a chart.
We can supply the missing information.
Now you can answer the question.