Answer to Question #215039 in Statistics and Probability for Rana M Liaqat

Question

Q.2 The quickest method to compute the probability that by choosing

by chance 3 pupils, one out of each school, at least one of them wears glasses, is

to evaluate the probability that none of them wears glasses. If B is the event that

at least one of the 3 pupils wears glasses.

Answer 1

If B is the event that at least one of the 3 pupils wears glasses, then the probability that none of them wears glasses is P(0) = 1 - B.