Set is a collection of well defined and distinct objects.
POINTS TO KNOW
- n(AᴜB) is the number of elements present in either of the sets A or B.
- n(A∩B) is the number of elements present in both the sets A and B.
For two sets A and B
- n(AᴜB) = n(A) + (n(B) – n(A∩B)
For three sets A, B and C
- n(AᴜBᴜC) = n(A) + n(B) + n(C) – n(A∩B) – n(B∩C) – n(C∩A) + n(A∩B∩C)
SOME VEEN DI AGRAM REPRESENTATIONS:
In above diagram set A is the subset of set B