Question

If n(A) = 5, n(B) = 6 and n(A ∩ B) = 3 then n(A × B ∩ B × A) is​

Answer 1

Answer:

Given.

n(A)=5,

n(B)=6,

n(A ∩ B)=3

By formula :

n(A × B ) = n(A)×n(B)

NOW

n(A × B ∩ B × A) = n(A × B × A) [B ∩ B=B]

n(A × B × A) = n(A × B ) [ A × A=A]

n(A × B ) = n(A)×n(B)

= 5*6 = 30. ans