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Mathematics
Problem
A mapping
f
f
f
from the set
A
=
{
1
,
2
,
3
,
4
}
A=\{1,2,3,4\}
A
=
{
1
,
2
,
3
,
4
}
to the set
B
=
{
1
,
2
}
B=\{1,2\}
B
=
{
1
,
2
}
is specified by
f
(
1
)
=
1
,
f
(
2
)
=
2
,
f
(
3
)
=
1
,
f
(
4
)
=
p
.
f(1)=1,\; f(2)=2,\; f(3)=1,\; f(4)=p.
f
(
1
)
=
1
,
f
(
2
)
=
2
,
f
(
3
)
=
1
,
f
(
4
)
=
p
.
For which value of
p
∈
B
p\in B
p
∈
B
will
f
f
f
be onto
B
B
B
? a) Either
1
1
1
or
2
2
2
b)
1
1
1
c)
2
2
2
d)
3
3
3
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