Question

If n(A - B)= 18, n(A union B)= 70 and n(A intercept B)= 25, then find n(B).​

Answer 1

Step-by-step explanation:

n(A-B) =18

n(A U B) = 70

n(A intersection B) =25

n(B-A) = n(A U B) - n(A intersection B) - n(A-B)

=70 - 25 - 18

=27

n(B) = n(A intersection B) + n(B-A)

= 25 + 27

= 52

n(B) = 52