Question

if n(u)=50,n(A)=30,n(AnB)=12and n(AuB)'=15 find 1.n(B) 2.n(B-A)​

Answer 1

Answer:

I hope this picture would help you

Answer 2

Answer:

1. n(B) = 17 is the answer.

2. n(B - A)​ = 5 is the answer.

Step-by-step explanation:

n(u)=50

n(A)=30

n(AnB)=12

n(AuB)'=15

n(AuB)=n(u) - n(AuB)'

n(AuB) = 50 - 15 = 35

n(AuB) = n(A) + n(B) - n(AnB)

 35 = 30 + n(B) - 12

n(B) = 17

n(B - A)​ = n(B) - n(AnB)

n(B - A)​ = 17 - 12

n(B - A)​ = 5