Which one of the following is correct?
{x : x2 = -1, x Z} =
= 0
= {0}
= {}
Which one of the following is a finite set?
{x : x Z, x < 5}
{x : x W, x ≥ 5}
{x ; x N, x > 10}
{x : x is an even prime number}
The number of elements of the set{x : x Z, x2 = 1} is
3
2
1
0
If a finite set A has m elements, then the number of non-empty proper subsets of A is
2m
2m -1
2m-1
2(2m-1-1)
If A = {3,4,5,6} and B = {1,2,3,5,6}, then =
{1,2,3,4,5,6}
{1,2,3,4,6}
{1,2,5,6}
{3,4,5,6}
If A is a proper subset of B, then A∩B =
A
B
The number of subsets of the set {10,11,12} is
8
6
7
If A is a proper subset of B, then =
A∩B
If X = {a,{b,c},d}. Which of the following is a subset of X
{a,b}
{b,c}
{c,d}
{a,d}
Given A = {5,6,7,8}. Which one of the following is incorrect?
Φ A
{7,8,9}
{5}
