Question

if A and B are two infinite sets such that n (A)=60,n (An
B)=140 and n (AnB)=30, then find n (Bz​

Answer 1

Answer:

As we know,

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

140=60+n(B)-30

140-30=n(B)

n(B)=110