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Mathematics
Problem
Let
A
=
{
1
,
2
,
3
}
A=\{1,2,3\}
A
=
{
1
,
2
,
3
}
and
B
=
{
a
,
b
}
B=\{a,b\}
B
=
{
a
,
b
}
. A function
f
:
A
→
B
f:A\to B
f
:
A
→
B
is defined by
f
(
1
)
=
a
f(1)=a
f
(
1
)
=
a
,
f
(
2
)
=
b
f(2)=b
f
(
2
)
=
b
,
f
(
3
)
=
b
f(3)=b
f
(
3
)
=
b
. Is
f
f
f
onto? Give a brief reason for your answer.
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