# october test

Sets

- The set A = { x\ x2 – 7x + 12 =0 } is

A.{ 3 , 4 } B. { -3 , 4 } C.{ 3 , -4 } D.{ -3 , -4 } E. None of them

2.The element(s) of A ={ (x,y)\ x+y=8 where x and y are positive integers and x≥ y} is- (1,3) 2.(4,4) 3. (5,3)

A.1 only B. 2 only C.3 only D.1 and 2 only E.2 and 3 only

3.Given that S= {0,1,2,3,4} is the universal set and A={ x\ x3 – 9x =0 }.Then A=……..

A.{ -3 , 0, 3 } B. { -3 , 0 } C.{ 0 , 3 } D.{ -3 , -3 } E.{0,9}

4.The interval { x\ -2≤ x < 3 }is denoted by

A.( -2 , 3 ) B. [ -2 , 3 ] C.[ -2 , 3 ) D.( -2 , 3 ] E. None of these

- (1,3) 2.(4,4) 3. (5,3)
- The graph on the number line is denoted by

2 3

A.(-2,3) B.[-2,3) C. (-2,3] D.[-2,3] E. Non of these

6.If A={x\x≥4,xϵR} and B={x\x<8 ,x∈R} then A∩B is

A. {x\8≥x≥4} B. {x\8≥x>4} C. {x\8≤x≤4}

D. {x\8≤x<4} E.Non of these

7.If P=[2,7) and Q=(3,7], then P∩Q =………..

A.(3,7] B.(2,7] C.(3,7) D.[2,7] E.(4,7)

8.Let S=R if A={x\x<a},B={x\x>a} then (A∪B)´ is

A.∅ B.{a} C. {0} D.R{a} E.R - If P={x\x3+x2-6x=0 and x≥0} then P=…………

A.{2,0,-3} B.{2} C.{2,0} D.{-2} E.{2,-3}

10.The graph of the solution set of the inequation 5-x≥1 is

A. B. C. D. E.

4 4 -4 -4 -4

11.If A={a,b,c} , B={b,c,d} and C= {a,b,e} then A∩(B∪C)=……

A. {a,d,e} B.{a,d} C.{a,c,d} D.{a,b,d} E.{a,b,c} - If x∈ (P∩Q), which of the following is (are) true?

1.x∈P 2. x∈ 3. x∈(P∪ Q)

A.1 only B. 2only C. 1and3 only D. 2and3 only E. 1,2 and 3 - A={x\x is an integer,1<x<12} and

B={x\x is a positive integer and less than 15 and x is multiple of3}then A∩B is

A.{3,6,9,12} B{2,3,4,5,6,7,8,9,10,11} C.{6,9,12} D.{3,6,9,12,15} E.{3,6,9}

14.If A≠B, which of the following is true?

A. A∩B=B∩A B.A∪B=B∪A C.A∪A=A D.B∩B=B

E.A\B=B\A

15.If S={1,2,3,4,5,6,7} is the universal set ,P={1,2,3,4} and Q´={1,2,7}, then P∩Q=…..

A. {1,2,3} B.{3,4} C.{3} D.{4} E.∅

16.If P∪Q={x,y,z,u,v},P∩Q={z,u} ,P\Q={x,v} then Q\P=…….

A.{y,z,u} B. {y} C.{x,u,v} D. ∅ E. None of these

17.Given E={2,4} ,F={4,6,8,x} The value of x such that E\F=∅

A.0 B.2 C.4 D.6 E.8

18.Let n(P) denotes the number of elements in set P. Given that n(P)=7 and n(Q)=3

the largest possible value of n(P∩Q) is

A.10 B.9 C.7 D.4 E.3

- Let n(P) denotes the number of elements in set P. Given that n(P)=2 and n(Q)=5

the smallest possible value of n(P∩Q) is

A.5 B.2 C.3 D.7 E.8

20.Which of the following is (are) true?- {x\x2-5x+6=0}⊂{x\2≤x≤4}

2.{x/x is an even number}∩{x\x is an odd number}

3.A∪A´=S

A.1 only B. 2 only C.3 only D . 1,2 and 3 E. None of these

21.How many subsets of A\B if A={2,3,5,8} and B={x\x3-8x+15=0}

A.4 B.8 C.16 D. 32 E.2

- {x\x2-5x+6=0}⊂{x\2≤x≤4}
- If A={a,b,c} and B={a,b,c,d,e} , then the number of subsets of A∩B is

A.4 B.8 C.16 D. 32 E.2

23.If A⊂B ,which of the following is false?

A.A∪B=B B.A∩B=A C.A∪(A∩B)=A D.A∩(A∪B)=A E.None of these - If A´={1,2,3,47} and B´={3,4,5,6}, then the number of subsets of (A∪B)´ is

A. 2 B. 3 C. 4 D.6 E.8

25.If n(A)=10 , n(B)=7 and n(A∩B)=4, then number of the elements of A which are not the

element of B is

A. 3 B.6 C. 8 D. 11 E. 14 - 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,

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