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This question already has an answer here:

I am trying to get a set of random integers for which I used the function RandomInteger[{1, 50}, 5]. That way, however, there is the chance to get doubles such as {46, 7, 9, 39, 39}. How do I avoid numbers being drawn twice?

Thank you very much for your help

Sincerely

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marked as duplicate by halirutan, Sjoerd C. de Vries, Oleksandr R., Artes, Kuba Sep 4 '13 at 21:41

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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What you are searching is the function RandomSample

RandomSample[Range[50], 5]
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