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There are 200 individuals with skin disorders, 120 had been exposed to chemical C1, 50 to chemical C2 and 30 to chemical C1 and C2. Find the number of individuals exposed to
(a) Chemical C1 but not C2
(b) Chemical C2 but not C1
(c) Chemical C1 or C2
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Answer:(a) Chemical C1 but not C2.
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