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Mathematics
Mathematics
Problem
Let
A
=
{
1
,
2
,
3
,
4
,
5
}
A=\{1,2,3,4,5\}
A
=
{
1
,
2
,
3
,
4
,
5
}
and
B
=
{
1
,
2
,
3
,
4
,
5
}
B=\{1,2,3,4,5\}
B
=
{
1
,
2
,
3
,
4
,
5
}
. How many ordered pairs
(
a
,
b
)
(a,b)
(
a
,
b
)
satisfy that
a
a
a
divides
b
b
b
? a) 11 b) 9 c) 10 d) 12
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