Random Numbers Generated Without Repeating

Sep 7, 2006

In my worksheet in column CC in C1:C20 I want Excel to ganerate 20 random numbers between 1 and 80 without repeating the same numbers.

At present I have the following formula entered and it works, but after I click F9 some repeated numbers are generated.

=INT(RAND()*(80-1)+1)

How can I change the formula or replace it?

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