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OpenStudy (anonymous):
In a survey of 400 households regarding ownership of HDTVs and DVD players, the following data were obtained. 315 households own one or more HDTVs. 155 households own one or more HDTVs and one or more DVD players. 20 households do not own an HDTV or a DVD player. How many households only own one or more DVD players?
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OpenStudy (***[isuru]***):
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OpenStudy (***[isuru]***):
u need to find|dw:1391495255137:dw| this area
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