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Question
Mathematics
Which of the following is a null set ?
Q. Which of the following is a null set ?
421
184
Sets
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A
{
0
}
B
{
x
:
x
>
0
or
x
<
0
}
C
{
x
:
x
2
=
4
or
x
=
3
}
D
{
x
:
x
2
+
1
=
0
,
x
∈
R
}
Solution:
Correct answer is (d)
{
x
:
x
2
+
1
=
0
,
x
∈
R
}