Establish that:`n(A uu B)=n(A)+n(B)-n(AnnB)`

If A and B are two finite sets,then prove that n(A uu B)=n(A)+n(B)-n(AnnB)

Is n(A-B)=n(A)-n(B)?

For any two sets A and B prove that n(A-B)=n(A)-n(AnnB) .

If A and B are two sets such that n(AuuB)=50 ,n(A)=28,n(B)=32,then find n(AnnB) .

If A,B are two sets and U is the universal set such that n(U)=700,n(A)=200,n(B)=300 and n(AnnB)=100 .Find n(A'nnB') .

If n(A uu B) = 50 , n(A) = 31 and n(B) = 23 , find n(A nn B) , n(A-B) and n(B-A)

If A + B + C= 1 80^@ and sin(A+C/2)=n sin (C/2) ,show that tan(A/2)tan(B/2)=(n-1)/(n+1)