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`

Explanation

To solve the problem, we will use the principle of set theory and Venn diagrams. Let's break it down step by step.

### Step 1: Understand the given data
We have the following information:
- Total individuals with skin disorder = 200
- Individuals exposed to chemical C1 = 120
- Individuals exposed to chemical C2 = 50
- Individuals exposed to both chemicals C1 and C2 = 30
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