Question

n(a)=15,n(b)=20,n(a-b)=7 then fimd n(a union b) ,n (a intersection b), n(b-a)​

Answer 1

Answer:

n(A union B)=27, n(A intersection B)=8,n(B-A)=12

Step-by-step explanation:

it is given,

n(A)=15

n(B)=20

n(A-B)=7

we know that,

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

=>n(A intersection B)=15-7

=8

slly,

n(B-A)=12

now,

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

=15+20-8

=27