=SUMPRODUCT((A1:A10<"")/COUNTIF(A1:A10,A1:A10&""))

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HTH

Bob Phillips

"needhelp" wrote in message
...
I'm using Excell. I have a row of numbers, some of which repeat. I want to
count how many unique numbers I have, thus eliminating duplicates. What
formula and criteria do I use?

Ex: 2 34 5 26 77 8 91 42 3 26 1 77 50 26
In the above example, the correct answer should be 11
since I want to count 26 and 77 only once.