2. a survey was conducted of 120 college students about which magazines subscriptions were used in their business or current event courses. the survey found that 40 students use the magazine "forbes", 30 use "kiplinger", and 75 use "us news and world report". 15 use both "forbes" and "kiplinger". 12 use both "forbes" and "us news and world report", and 10 use both "kiplinger" and "us news and world report". 4 use all 3 magazines in their classes. how many students use to exactly 1 magazine in their classes?
