Let A and B be two finite sets such that n(A) = 20, n(B) = 28 and n(A ∪ B) = 36, find n(A ∩ B).

Using the formula n(A ∪ B) = n(A) + n(B) - n(A ∩ B). 

then n(A ∩ B) = n(A) + n(B) - n(A ∪ B) 

                   = 20 + 28 - 36 

                   = 48 - 36 

                   = 12 

  • 2
12
  • 1
Ooosid
  • -1
Jdhcidid
  • -1
What are you looking for?