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There are500500500 students in a high school senior class. Of these 500500500 students, 300300300 regularly wear a necklace to school, 200200200 regularly wear a ring, and 125125125 regularly wear a necklace and a ring. Using this information, answer each of the following questions.Let NNN be the event that a randomly selected senior regularly wears a necklace and RRR be the event that a randomly selected senior regularly wears a ring. |
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