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2002 Indonesia MO
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1
Part of
2002 Indonesia MO
Problems
(1)
Prove of divisibility
Source: INAMO 2002 - Problem 1
8/5/2011
Prove that
n
4
ā
n
2
n^4 - n^2
n
4
ā
n
2
is divisible by
12
12
12
for all integers
n
>
1
n > 1
n
>
1
.
number theory