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There are 200 individuals with a skin di...

There are 200 individuals with a skin disorder, 120 had been exposed to the chemical `C_(1), 50` to chemical `C_(2)`, and 30 to both the chemicals `C_(1) and C_(2)`. Find the number of individuals exposed to
(i) Chemical `C_(1)` but not chemical `C_(2)`
(ii) Chemical `C_(2)` but not chemical `C_(1)`
(iii) Chemical `C_(1)` or chemical `C_(2)`

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