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West End High School has 640 students. All the students responded to a sums},r about what sights they have visited in Washington. DC. Some of the results are as follows. 18!) students have visited the National Zoo. 12f]| students have visited Capitol Hill. 22!} students have visited the National Zoo or Capitol Hill. Based on the survey. what is the probability that a randomly chosen student at West End High School has visited both the National Zoo and Capitol Hill? 1 5 a. C. 15 32 l 15 h. d. 8 32