1.Set Theory
easy

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

Chemical $C_{1}$ or chemical $C_{2}$

A

$140$

B

$140$

C

$140$

D

$140$

Solution

Let $U$ denote the universal set consisting of individuals suffering from the skin disorder, $A$ denote the set of individuals exposed to the chemical $C_{1}$ and $B$ denote the set of individuals exposed to the chemical $C_{2}$

Here $\quad n( U )=200, n( A )=120, n( B )=50$ and $n( A \cap B )=30$

The number of individuals exposed either to chemical $C_{1}$ or to chemical $C_{2}$, i.e., $n( A \cup B )=n( A )+n( B )-n( A \cap B )$

$=120+50-30=140$

Standard 11
Mathematics

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