Sum excel complex issues

excel in all odd-numbered lines combined sum? Likewise:
all the odd-even line
out the
even
out any arbitrary number of lines
out
any region in a row
Not for any arbitrary number of regional
cells are the summation of how to calculate?

A field To determine whether the ranks of the odd-even, and then sum SUMIF formula:
the line
even the odd
out the

even out the following SUM directly with the scope of the election:
Arbitrary Arbitrary
a few lines out
any region in a row
any non-consecutive regional
any sum of the number of cell