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 = Ac ∩ B
A - B = A∩Bc
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 = ex , 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:x2 = 4 or x=3}
{x: x2 + 1 = 0, x∈R}
