if n (a) =20,n(b)=28and n (A U B)=36 then n (A B) =?
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Answer: IF A and B be two finite set such that it is given,
⟹ n{A}=20 n{B}=28 n{A∪B}=36 n{A∩B}=?
n{A∪B}= n{A}+ n{B} - n{A∩B}
→36=20+28 -n{A∩B}
→36=48 - n{A∩B}
→n{A∩B}=48-36
→n{A∩B}= 12
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