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Mathematics
Problem
Which one of the following relations from
A
=
{
a
,
b
,
c
}
A=\{a,b,c\}
A
=
{
a
,
b
,
c
}
to
B
=
{
1
,
2
}
B=\{1,2\}
B
=
{
1
,
2
}
is a function? a)
{
(
a
,
1
)
,
(
b
,
2
)
,
(
c
,
1
)
,
(
d
,
2
)
}
\{(a,1),(b,2),(c,1),(d,2)\}
{(
a
,
1
)
,
(
b
,
2
)
,
(
c
,
1
)
,
(
d
,
2
)}
b)
{
(
a
,
1
)
,
(
b
,
2
)
}
\{(a,1),(b,2)\}
{(
a
,
1
)
,
(
b
,
2
)}
c)
{
(
a
,
1
)
,
(
b
,
2
)
,
(
c
,
1
)
}
\{(a,1),(b,2),(c,1)\}
{(
a
,
1
)
,
(
b
,
2
)
,
(
c
,
1
)}
d)
{
(
a
,
1
)
,
(
b
,
2
)
,
(
c
,
1
)
,
(
a
,
2
)
}
\{(a,1),(b,2),(c,1),(a,2)\}
{(
a
,
1
)
,
(
b
,
2
)
,
(
c
,
1
)
,
(
a
,
2
)}
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