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1. In a survey of 39 instructors, it was found that 23 liked whiteboards, 20 liked blackboards, and 9 liked both.How many instructors like whiteboards

1. In a survey of 39 instructors, it was found that 23 liked whiteboards, 20 liked blackboards, and 9 liked both.How many instructors like whiteboards only? How many instructors liked

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20. In a Survey of 39 instructors, it was found that 23 liked Whiteboards, 20 liked blackboards, and 9 liked both. How many instructors like whiteboards only? How many instructors liked blackboards only? How many instructors liked neither

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