Question

If n(A)=15, n(B)=40, n( A∪B)=35 then n( A∩B)=....​

Answer 1

Answer:

Given = n(A)=15, n(B)=40, n( A∪B)=35

Using  n( A∪B) = n(A) + n(B) - n( A∩B)

=> 35 = 15 + 40 - n( A∩B)

=> n( A∩B) = 15 + 40 - 35 = 20

Therefore, n( A∩B) = 20