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200 persons have a skin disease, our of ...

200 persons have a skin disease, our of which 120 presons are effected with chemical `C_(1)`, 50 with chemical `C_(2)` and 30 with chemical `C_(1) and C_(2)` both. Find the number of persons who
(i) are effected with `C_(1) or C_(2)`
(ii) are effected with `C_(1)` but not `C_(2)`
(iii) are effected with `C_(2)` but not `C_(1)`.

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