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Question

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

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Solution

Given:
Number of people having skin disorder =200
Number of people exposed to chemical C1=120
Number of people exposed to chemical C2=50
Number of people exposed to both chemical C1 and C2=30

(i)
Number of people exposed to chemical C1 but not chemical C2= Number of people exposed to chemical C1 Number of people exposed to both chemical C1 and C2
=12030
=90
Hence, the number of individuals exposed to chemical C1 but not to chemical C2 is 90.

(ii)
Number of people exposed to chemical C2 but not chemical C1= Number of people exposed to chemical C2 Number of people exposed to both chemical C1 and C2
=5030
=20
Hence, the number of individuals exposed to chemical C2 but not to chemical C1 is 20.

(iii)
Let U denote the universal set consisting of individuals suffering from skin disorder, A and B denote the set of individuals exposed to chemical C1 and C2 respectively.
n(U)=200,n(A)=120,n(B)=50 and n(A B)=30
n(A B)=n(A)+n(B)n(A B)
=120+5030
=17030
=140
140 individuals are exposed either to chemical C1 or to chemical C2.

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