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Mathematics
Mathematics
Problem
Let
A
=
{
1
,
3
,
5
,
7
}
A=\{1,3,5,7\}
A
=
{
1
,
3
,
5
,
7
}
and
B
=
{
2
,
4
,
6
}
B=\{2,4,6\}
B
=
{
2
,
4
,
6
}
. Find the number of ordered pairs
(
a
,
b
)
(a,b)
(
a
,
b
)
with
a
∈
A
a \in A
a
∈
A
and
b
∈
B
b \in B
b
∈
B
such that
a
+
b
a+b
a
+
b
is even.
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