Question

. Let A and B be two sets such that n(A)=20, n(A∪B) =42 and n(A∩B)=4.
Find (i) n(B) (ii) n(A-B) (iii) n(B-A).

Answer 1

Answer:

(i)26 (ii)16 (iii)22

Step-by-step explanation:

for n(B)

n(B)=n(A)-n(A∩B)-n(A∪B)

for (ii)

n(A)-n(A∩B)

for (iii)

n(B)-n(A∩B)