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Mathematics 10 Online
OpenStudy (anonymous):

A company that manufactures smartphones makes 70% of the phones with a touch screen and 55% of the phones with HD movie capability. 30% of the phones have both a touch screen and HD movie capability. What is the probability that a smartphone chosen at random has either a touch screen or HD movie capability? 19/20 47/50 13/20 43/50 17/20

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