An anonymous survey of college students was taken to determine behaviors regarding alcohol, cigarettes, and illegal drugs. The results were as follows:837 drank alcohol regularly, 639 smoked cigarettes, 176 used illegal drugs, 388 drank alcohol regularly and smoked cigarettes, 100 drank alcohol regularly and used illegal drugs, 105 smoked cigarettes and used illegal drugs, 83 engaged in all three behaviors, and 358 engaged in none of these behaviors. a) How many students were surveyed? b) How many drank alcohol or smoked cigarettes ? c) How many drank alcohol only? Of those surveyed,

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