Hi everyone,

I use the following function to count # of unique values in a range:

SUM(N(FREQUENCY(A1:A50,A1:A50)0))

In one file, it works well. In another, I don't get right answer!?
Although I don't know what "N" stands for, I wonder what am I missing
here?

I got this function from www.cpearson.com/excel/duplicate.htm which is
now off-line!

Any help why I am getting wrong answer for the 2nd file?

Regards,
Mike