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1.
If 
denotes the number of combinations of 
things takes 
at a time, then the expression 
, equals
denotes the number of combinations of things takes at a time, then the expression , equals
2.
If 
where 
, then the ordered pair (
) is
where , then the ordered pair () is
3.
The number of diagonals that can be drawn by joining the vertices of an octagon is