probability

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In a study of Tibetan children, a total of 1546 children were examined. Of these, 1017 had rickets. Of the 245 urban children in the study, 94 had rickets. (a) How many children living in nonurban areas had rickets?
1Your answer is incorrect.

(b) How many children living in nonurban areas did not have rickets?
2

  • probability -

    a. 1017 - 94 = ?

    b. 1546 - 245 - your previous answer = ?

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