A survey of 70 college students showed the following data: 42 had a car; 50 had a

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A survey of 70 college students showed the following data:


42 had a car; 50 had a TV; 30 had a bicycle; 17 had a car and a bicycle; 35 had a car and a TV; 25 had a TV and a bicycle; 15 had all three 


How many students had none of the three items?

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