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Johncobb Johncobb is offline
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Default I want random numbers generated without repeating numbers

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?
Thank you in advance for your help.
Ragards to all supporters.
John.