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Mathematics
Mathematics
Problem
For
A
=
{
0
,
1
,
2
}
A = \{0,1,2\}
A
=
{
0
,
1
,
2
}
and
B
=
{
1
,
2
}
B = \{1,2\}
B
=
{
1
,
2
}
, how many ordered pairs
(
a
,
b
)
∈
A
×
B
(a,b) \in A \times B
(
a
,
b
)
∈
A
×
B
satisfy
a
<
b
a < b
a
<
b
? a)
5
5
5
b)
2
2
2
c)
3
3
3
d)
4
4
4
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