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Mathematics
Mathematics
Problem
Let
A
=
{
x
∈
N
∣
x
<
4
}
A = \{x \in \mathbb N \mid x < 4\}
A
=
{
x
∈
N
∣
x
<
4
}
and
B
=
{
y
∈
N
∣
2
≤
y
≤
4
}
B = \{y \in \mathbb N \mid 2 \le y \le 4\}
B
=
{
y
∈
N
∣
2
≤
y
≤
4
}
. How many elements does
A
×
B
A \times B
A
×
B
contain? a) 12 b) 9 c) 8 d) 6
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