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Mathematics
Mathematics
Problem
2. Let
A
=
{
a
,
b
}
,
B
=
{
a
,
b
,
c
}
\mathrm{A}=\{a, b\}, \mathrm{B}=\{a, b, c\}
A
=
{
a
,
b
}
,
B
=
{
a
,
b
,
c
}
. Is
A
⊂
B
\mathrm{A} \subset \mathrm{B}
A
⊂
B
? What is
A
∪
B
\mathrm{A} \cup \mathrm{B}
A
∪
B
?
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