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Mathematics
Mathematics
Problem
Let
A
=
{
1
,
2
,
3
}
A=\{1,2,3\}
A
=
{
1
,
2
,
3
}
and
B
=
{
4
,
5
}
B=\{4,5\}
B
=
{
4
,
5
}
. Consider the subset
S
S
S
of
A
×
B
A\times B
A
×
B
consisting of all pairs
(
a
,
b
)
(a,b)
(
a
,
b
)
such that
a
+
b
a+b
a
+
b
is even. How many elements does
S
S
S
contain? a)
6
6
6
b)
2
2
2
c)
3
3
3
d)
4
4
4
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