How do you avoid duplicates when using the randbetween function?

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

I am trying to use the rand or randbetween function to select random samples,
but I keep receiving duplicate numbers. For example, I have a list of 70
samples but only want to select 25. I type in the formula and then drag it
down 25 cells, but some of those cells have the same number. How do I make
them unique?

Thanks!
 
If you put the formula

=RAND() in A1 and copy down to A70 then in B1

=RANK(A1,A$1:A$70)

and copy down to B25 this should give you 25 different integers between
1 and 70
 
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