Of the 68 students in the fourth grade at Northwest Elementary School, four have red hair (R), 14 have blond hair (Bn), and 24 have black hair (Bk). Publish BFW How many fourth-graders have either red, blond, or black hair, R U Bn U Bk? What is the probability that a randomly-selected fourth grader has red, blond, or black hair, P(R U Bn U BK)? P(R U Bn U BK) = (Express your answer to three decimal places.)