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In a study of the incidence of rickets in Tibetan children, a total of 1,556 urban and nonurban children were examined. Of these 1,019 had rickets. Of the 235 urban children in the study, 90 had rickets. Use Venn diagrams to determine how many children in nonurban areas had rickets, and how many children in nonurban areas did not have rickets.
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