For two sets A & B

n(A) = Number of elements of set A

n(B) = Number of elements of set B

 

n(A ∪ B) = n(A) + n(B) – n(A ∩ B)

 

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  1. Chapter 1 Class 11 Sets
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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.