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7 of the students in Jonathans class have been on a boat. 7 students have been on a train, and 4 students have been on both

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In Boat = 7 In Train=7 Both Boat and Train=4 Boat Train a b a+c= 7 b+c=7 C = 4 .: a = 3 b = 3 students on train but not om bo

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