Question

if A and B are two subsets of universal set U such that n(A) =40 ,n(B)=30 and n(A∪B) =60, find n(A ∩ B)

Answer 1

Answer:

By demorgans law,

60=40+30-n(A intersect B)

60=70-n(A intersect B)

n(A intersect B) =70-60

=10

Step-by-step explanation:

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