Question

6.1f n(A) = 4, n (B)=5. n(AnB)=3, then n(
A x B) n(B x A) Is
(1) 8
(2) 9
(3) 10
(4)6​

Answer 1

Answer:

n(A) = 4

n(B)=5

n(AnB)=3

For (A×B)∩(B×A) we have to do the mapping of A×B or B×A between common elements.

no. of ways of mapping will be 3×3=9

n[(A×B)∩(B×A)]=9