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No links 11:51 am Meritnation 0 40 0 60 0 70 Solution Let U be the set of all surveyed students in the School, C be the set of students preferring to watch comedy movie, and A be the set of students preferring to watch action movie. Then, according to the given information, n (U) 500, n (C) 260, n (A) 280, n (C' n A) 20 n (C U A)' 20 n (U) — n (C U A) 20 500 -n (C U A) 20 -S n (C U A) 500 - 20 480 It is known that, n (C U A) = n (C) + n (A) - n (C n A) .•.480 260 + 280 - n (C n A) -s n (C n A) 260 + 280 - 480 = 60 Thus, 60 students prefer to watch both types of movies. The correct answer is C. Q.16