For the conditions of Exercise 4, what is the probability that exactly one of the two students will fail the examination?
In Exercise 4
If the probability that student A will fail a certain statistics examination is 0.5, the probability that student B will fail the examination is 0.2, and the probability that both student A and student B will fail the examination is 0.1, what is the probability that at least one of these two students will fail the examination?