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1.
If 
, then 
is equal to
, then is equal to
2.
If the coefficients of second, third and fourth terms in the expansion of 
are in A.P., then
are in A.P., then
3.
If 
, then the coefficient of 
in the expansion of 
, is
, then the coefficient of in the expansion of , is
4.
5.
If 
then 
is equal to
then is equal to