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Mathematics
Mathematics
Problem
If
n
(
A
)
=
m
n(A)=m
n
(
A
)
=
m
and
n
(
B
)
=
n
n(B)=n
n
(
B
)
=
n
where
m
,
n
m,n
m
,
n
are positive integers, how many ordered pairs are there in the Cartesian product
A
×
B
A \times B
A
×
B
?
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