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Byju's Answer
Standard VI
Mathematics
Empty Set
what is into ...
Question
what is into function , many to one function ,one -one function
Open in App
Solution
Dear student,
I
N
T
O
F
U
N
C
T
I
O
N
:
A
f
u
n
c
t
i
o
n
f
:
A
→
B
i
s
a
n
i
n
t
o
f
u
n
c
t
i
o
n
i
f
t
h
e
r
e
e
x
i
s
t
s
a
n
e
l
e
m
e
n
t
i
n
B
h
a
v
i
n
g
n
o
p
r
e
-
i
m
a
g
e
i
n
A
.
I
n
o
t
h
e
r
w
o
r
d
s
,
f
:
A
→
B
i
s
a
n
i
n
t
o
f
u
n
c
t
i
o
n
i
f
i
t
i
s
n
o
t
a
n
o
n
t
o
f
u
n
c
t
i
o
n
.
M
A
N
Y
-
O
N
E
F
U
N
C
T
I
O
N
:
A
f
u
n
c
t
i
o
n
i
s
s
a
i
d
t
o
b
e
a
m
a
n
y
-
o
n
e
f
u
n
c
t
i
o
n
i
f
t
w
o
o
r
m
o
r
e
e
l
e
m
e
n
t
s
o
f
s
e
t
A
h
a
v
e
t
h
e
s
a
m
e
i
m
a
g
e
i
n
B
.
I
n
o
t
h
e
r
w
o
r
d
s
,
f
:
A
→
B
i
s
a
m
a
n
y
-
o
n
e
f
u
n
c
t
i
o
n
i
f
i
t
i
s
n
o
t
a
o
n
e
-
o
n
e
f
u
n
c
t
i
o
n
.
O
N
E
-
O
N
E
F
U
N
C
T
I
O
N
:
A
f
u
n
c
t
i
o
n
i
s
s
a
i
d
t
o
b
e
o
n
o
n
i
f
d
i
f
f
e
r
e
n
t
e
l
e
m
e
n
t
s
o
f
A
h
a
v
e
d
i
f
f
e
r
e
n
t
i
m
a
g
e
s
i
n
B
.
T
h
u
s
,
f
i
s
o
n
e
-
o
n
e
⇔
a
≠
b
⇒
f
(
a
)≠
f
(
b
)
f
o
r
a
l
l
a
,
b
∈
A
⇔
f
(
a
)=
f
(
b
)⇒
a
=
b
f
o
r
a
l
l
a
,
b
∈
A
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