The number of proper subsets of the set {1,2,3} is -----------

8

7

6

5

Let A and B be subsets of a set X. Then

A - B = A∪B

A - B = A∩B

A - B = A^{c} ∩ B

A - B = A∩B^{c}

B - A is defined as

{x/x∈A, x∉B}

{x/x∈B, x∉A}

{x/x∉A, x∉B}

{x/x∈B, x∈A and B}

If the sets A and B are defined as A = {(x,y): y = e^{x} , x∈R} B = { (x,y): y = x, x∈R} then

B⊆A

A⊆B

A∩B = ∅

A∪B = A

If A and B are disjoint,then n(A∪B) is equal to

n(A)

n(B)

n(A) + n(B)

n(A) * n(B)

Which of the following statement is true ?

3 ⊆ {1,3,5}

3 ∈ {1,3,5}

{3} ∈ {1,3,5}

{3,5} ∈ {1,3,5}

If X and y are two sets such that n(x) = 17, n(y) = 23 and n(x∪y) = 38. Then n (x∩y) = ?

40

78

2

None of these

The smallest set A such that A∪{1,2} = {1,2,3,5,9} is

{2,3,5}

{3,5,9}

{1,2,5,9}

none of these

Given n(U) = 20, n(A) = 12, n(B) = 9 , n(A∩B) = 4 , where U is the universal set, A and B are subsets of U then n[(A∪B)'] = -------------

17

9

11

3

Which of the following is a null set ?

{0}

{x:x>0 or x

{x:x^{2} = 4 or x=3}

{x: x^{2} + 1 = 0, x∈R}