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Mathematics
Problem
Let
A
=
{
1
,
2
,
{
3
,
4
}
,
5
}
A = \{1, 2, \{3, 4\}, 5\}
A
=
{
1
,
2
,
{
3
,
4
}
,
5
}
. Which of the following statements are incorrect and why? -
{
3
,
4
}
⊂
A
\{3, 4\} \subset A
{
3
,
4
}
⊂
A
-
{
3
,
4
}
∈
A
\{3, 4\} \in A
{
3
,
4
}
∈
A
-
{
{
3
,
4
}
}
⊂
A
\{\{3, 4\}\} \subset A
{{
3
,
4
}}
⊂
A
-
1
∈
A
1 \in A
1
∈
A
-
1
⊂
A
1 \subset A
1
⊂
A
-
{
1
,
2
,
5
}
⊂
A
\{1, 2, 5\} \subset A
{
1
,
2
,
5
}
⊂
A
-
{
1
,
2
,
5
}
∈
A
\{1, 2, 5\} \in A
{
1
,
2
,
5
}
∈
A
-
{
1
,
2
,
3
}
⊂
A
\{1, 2, 3\} \subset A
{
1
,
2
,
3
}
⊂
A
-
ϕ
∈
A
\phi \in A
ϕ
∈
A
-
ϕ
⊂
A
\phi \subset A
ϕ
⊂
A
-
{
ϕ
}
⊂
A
\{\phi\} \subset A
{
ϕ
}
⊂
A
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