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How do you randomly assign numbers without getting duplicates?

How do you randomly assign numbers without getting duplicates?

Price: FREE

I'm trying to randomly assign a number between 1 and 9004 for a mailing list in Excel. What I plan to do, is then sort cases from smallest number (1) to
largest number (9004) and take the first half to use in my sample for a survey project. I want each 'case' in the list to receive one number b/w 1 and 9004 with NO duplicates. The formulas I have tried using with no success
in eliminating duplicates a =TRUNC(RAND()*9004) and

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