Answer
43
Work Step by Step
Given,
number of elements in set A i,e, n(A) = 30
number of elements in set B i.e. n(B) = 18
The common elements of both sets is n(A∩B) = 5.
Formula for cardinal number of union of set is:
n(A∪B) = n(A)+n(B) - n(A∩B)
=30+18 -5
=48-5
=43
n(A∪B) = 43
