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Mathematics
Problem
Let
A
=
{
1
,
2
,
3
}
A=\{1,2,3\}
A
=
{
1
,
2
,
3
}
and
B
=
{
2
,
3
,
4
,
6
}
B=\{2,3,4,6\}
B
=
{
2
,
3
,
4
,
6
}
. Define the relation
R
R
R
from
A
A
A
to
B
B
B
by
R
=
{
(
a
,
b
)
∈
A
×
B
∣
b
=
2
a
or
a
divides
b
}
R=\{(a,b)\in A\times B\mid b=2a \text{ or } a\text{ divides } b\}
R
=
{(
a
,
b
)
∈
A
×
B
∣
b
=
2
a
or
a
divides
b
}
. How many ordered pairs does
R
R
R
contain? a)
10
10
10
b)
8
8
8
c)
9
9
9
d)
6
6
6
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