Question

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Answer 1

Step-by-step explanation:

total person = 260

person exposed to chemical A = 150

person exposed to chemical B = 74

person exposed both chemical A and B = 36

(i) chemical A but not B = 150/260 = 15/26

(ii) chemical B but not A = 74/260 = 37/130

(iii) chemaical A or or B = 36/260 = 9/65