# List of unequal random numbers [duplicate]

How can I generate a list of 10 random integer numbers in the range between 0 and 100 so that all random numbers are unequal?

• Jul 12 '16 at 14:32

RandomSample[Range[0, 100], 10]

• I was to much focused on RandomInteger, thanks.
– mrz
Jul 12 '16 at 14:33
• @happyfish if you saw my comment ... I'm sorry, that was unprofessional Jul 12 '16 at 16:05
• @Young I didn't, but I am curious now :P Jul 12 '16 at 16:09
• @Young I am also surprised by the votes and I agree with you. I feel guilty since I have almost never posted an answer that requires real effort in this community. Perhaps because as a beginner, my knowledge is a subset of many active users. It will still take me sometime to learn before I can make real contributions. Jul 12 '16 at 16:21
• @Young I'm of the opinion that for a lot of duplicate questions, especially from first time posters (not that that applies here), it's often better to answer and let others worry about marking duplicates. I feel like it may encourage them to come back more, and our community here is not so large as to discourage newbies Jul 13 '16 at 1:14

happy fish gave the right answer, but sometimes it's fun to go oldschool. You can use rejection sampling and a While loop

list = {};
While[Length@list <= 10,
list = DeleteDuplicates@Append[list, RandomInteger[100]]]

• I like this approach as you don't need to generate the full list. A small modification might save a lot of iterations: While[(l = Length[ids]) < n, ids = DeleteDuplicates[Join[ids, RandomInteger[max, n - l]]]] Jan 27 '21 at 9:11