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If n(A∪B)=28, and n (A∩B) =9 , n(A\B)=7. then n(B\A)=……….
A. 12 B. 16 C. 21 D. 19 E. 5

If A={1,3,5,7,9} and B´={1,2,3,4,5} , then A\B=……
A.{7,9} B.{2,4} C.{1,3,5} D. {1,2,3,4,5,7,9} E. None of these
28.If A∪B ={1,2,3,4,5,6,7,8} and A∩B={1,5,7} then (A\B)∪ (B\A)=………
A. ∅ B.{1,3,5} C. {2,3,4,6,8} D.{1,2,3,4,5,6,7,8} E.It is impossible to determine
29.Let S={1,2,3,4,5} be the universal set. If A∩B´={1,2} and B´={1,2,3}, then A∪B=…….
A. {5} B.{3,4} C.{3,4,5} D.{1,2,3,4} E. S
30.If P and Q are the two sets such that n(P)=4, n(Q)=6, n(P∩Q)=2, then n(P∪Q)=…….
A.2 B.4 C.6 D.8 E.10
31.If the universal set contains 500elements, n(A)=240, n(A∪B)=460,n(A∩B)=55,then(B´)=….
A. 275 B.225 C.125 D.325 E.175
32.For the Venn diagram, which of the following is (are) true;
1.X∩Y={3,4} 2. X\Y={1,2} 3.Y\X={5,6}

A.1 only B. 2 only C. 3 only D. 2 and 3 only E. 1,2 and 3
33.If P={a,b} and Q={x,y} , then PxQ=……….
A. {(a,x),(b,y)} B. {(a,x),(a,y)} C. {(a,x),(a,y),(b,x),(b,y)}
D.{(x,a),(x,b),(y,a),(y,b)} E.{(x,a),(y,b)}

Given that BxA={(2,1),(2,2),(x,1),(x,2)}.Then AxA=……….
A. {1,2} B.{(2,2),(2,x),(x,2),(x,x)} C.{(1,2),(2,1)}
D. {(1,1),(1,2),(2,1),(2,2)} E. {(1,1),(2,2),(x,x)}

If W={x,y} ,which of the following is falsfe?
A.(x,x) ∈WxW B. {(x,y)}⊂ WxW C.(x,y)⊂ WxW D. (y,y) ∈WxW E.{(y,y)}⊂WxW
36.If n(AxB)=24 and n(BxB)=36 ,then the largest possible valu