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1.
The coefficient of 
in the expansion of 
is
in the expansion of is
2.
In the polynomial 
. The coefficient of 
is
. The coefficient of is
3.
Let 
be an odd integer. If 
for every value of 
, then
be an odd integer. If for every value of , then
4.
In the expansion of 
the number of terms, is
the number of terms, is
5.
If is odd, then 
is equal to
is odd, then is equal to