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Mathematics
Mathematics
Problem
Let
A
=
N
A=\mathbb{N}
A
=
N
(the set of natural numbers) and
B
=
{
1
,
2
}
B=\{1,2\}
B
=
{
1
,
2
}
. Arrange the elements of
A
×
B
A\times B
A
×
B
in lexicographic order, and write the first six ordered pairs.
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