1.

Two set A and B are such that n(A ∪ B) = 21, n(A′ ∩ B′) = 9, n(A ∩ B) = 7, find n(A ∩ B)’.

Answer»

∴ n(A′ ∩ B′) = n(A ∪ B)’ = 9 

we know that, 

u = n(A ∪ B)’ + n(A ∪ B) 

= 9 + 21 

= 31 

∴ n(A ∩ B)’ =u - n(A ∪ B) 

= 30 - 7 

= 23



Discussion

No Comment Found

Related InterviewSolutions