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KEAM 2014 Math Paper
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© examsnet.com
Question : 58
Total: 120
If A = {1,3,5,7} and B = {1,2,3,4,5,6,7,8}, then the number of one-to-one functions fromA into B is
1340
1860
1430
1880
1680
Validate
Solution:
Given,
A
=
{
1
,
3
,
5
,
7
}
and
B
=
{
1
,
2
,
3
,
4
,
5
,
6
,
7
,
8
}
Here,
n
(
A
)
=
4
and
n
(
B
)
=
8
∴
Number of one-one function from
A
into
B
=
8
P
4
=
8
⋅
7
⋅
6
⋅
5
=
1680
© examsnet.com
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