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1.
is divisible by
is divisible by
2.
The sum of 
terms of the series 
is
terms of the series is
3.
For each 
, 
is divisible by
, is divisible by
4.
If is an even positive integer, then 
is divisible by
is an even positive integer, then is divisible by
5.
The greatest positive integer, which divides 
for all , is
for all , is