1.

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`

Answer» by using venn diagram
(i) 90
(ii) 20
(iii) 90+30+20 = 140
answer


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