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In a certain residential suburb of 240 households, 120 use the TV, 130 the newspaper, and...

  1. In a certain residential suburb of 240 households, 120 use the TV, 130 the newspaper, and 140 the Internet to get their news. If 80 families use both the TV and the newspaper, 90 both the Internet and the newspaper, 70 the TV and the Internet, and 50 use all three, what proportion of households use exactly one source to get their news?
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