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Mathematics 17 Online
OpenStudy (anonymous):

In a survey of 450 households regarding ownership of HDTVs and DVD players, the following data were obtained. 335 households own one or more HDTVs. 155 households own one or more HDTVs and one or more DVD players. 19 households do not own an HDTV or a DVD player. How many households only own one or more DVD players? households

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