Question

Let A and B be two subsets of U such that n(A)=5, n(B)=n(AUB)=7 and n(A')=12. Find. A: n (B') B: n (AUB)' C: n (U)​

Answer 1

Answer:

A: n (B') = 5

B: n (AUB)' = 0

C: n (U)​ = 7

Step-by-step explanation:

 A: n (B') = n(A)

     As n(A) = 5,

     A: n (B') = 5

 B: n (AUB)' = 0 as in the question,there are no elements which are not    

      present in n(AUB)​.

 C: n (U)​ = n(AUB)​ = 7

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