Question

if A and B are two sets such that n(A)=70, n(B)=60, n (A∪ ) =110 then n( ∩ )​

Answer 1

Answer:

20

AUB is n(A) +n(B) - n(AnB)

hence

110= 70+60-n(AnB)...

110=130-n(AnB)

n(AnB)= 20