Question

n(A)=12, n(B)=23 find n(A×B) and n(B×A)

Answer 1

Answer:

3 is the answer

Step-by-step explanation:

n(U)=20,n(A)=12,n(B)=9,n(A∩B)=4  

∴  n(A∪B)=n(A)+n(B)−n(A∩B)  =12+9−4=17 Hence, n[(A∪B)c]=n(U)−n(A∪B)

20−17=3