Question

n(A)=20,n(AuB)=55,n(AuB)=10,n(B)=?,n(A-B)=?n(B-A)=?​

Answer 1

Answer:

answer is 5

Step-by-step explanation:

using formula n(AUB)=n(A-B)+n(B-A)+n(A intersection B)

30=15+10+n(A intersection B)

30=25+n(A intersection B)

30-25 =n(A intersection B)

5=n(A intersection B). is your answ