Question

If n( € ) = 60, n(A) = 35, n(B') = 36, and n(
AB)' = 51,
then find n(A-B)​

Answer 1

n(A) = 35

n(B) = n(€) - n(B)' = 60 - 36 = 24

n(A)' = n(€) - n(A) = 60 - 35 = 25

n(B)' = 36

n(AUB)' = 51

n(A) + n(B) = 59

n( A Π B ) = 59 - 51 = 8

n(A - B ) = n( A ) - n(A Π B )

= 35 - 8

= 27