There are 200 individuals with a skin disorder, 120 has been exposed to chemical C1 and 50 to C2 and 30 to both. Finf the number of individual exposed to (i) C1 but not C2 (ii) C2 but not C1 (iii) C1 or C2.

There are 200 individuals with a skin disorder, 120 has been exposed to chemical $C_{1}$ and 50 to $C_{2}$ and 30 to both. Finf the number of individual exposed to (i) $C_{1}$ but not $C_{2}$ (ii) $C_{2}$ but not $C_{1}$ (iii) $C_{1}$ or $C_{2}$ .

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