Question

n(A)=50
n(AUB)=70
find B​

Answer 1

Answer:

Step-by-step explanation:

n(A)=50,n(AUB)=70,n(A∩B)=20

n(AUB)=n(A) + n(B) - n(A∩B)

70=50+n(B)-20

so n(B)=70-50+20=40

so n(B)=40