You're probably OK using the range.

Consider this:

The SUM function will accept 30 arguments (versions prior to Excel 2007).

=SUM(A1,A2,A3,A4,A5)

In the above example the function has 5 arguments. Each is separated by the
comma. So, using that syntax you could go up to A30.

=SUM(A1:A5)

The example above has 1 argument and does the exact same thing as the
example that has 5 arguments.

=SUM(A1:A5,B6:B10,C11:C15)

The example above has 3 arguments. Each argument is a range of cells.

I think what you're having trouble with is you're thinking that each cell in
a *range* counts as 1 argument. In the very first example I posted that
would be the case. So:

=SUM(G1:G50)

Has 1 argument, not 50

For more specific help you'd need to post the formula you're using along
with an explanation of what you're trying to do.