Random number generator with no duplicates

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You need to store them in a collection and each time you pick a new number you need to make sure it’s not present already, otherwise you need to generate a new number until you find a unique number.

Instead of this, I would generate a sequence between 1 and 49, shuffle them and pick 6 number out of the sequence, for example:

var rnd = new Random();
var randomNumbers = Enumerable.Range(1,49).OrderBy(x => rnd.Next()).Take(6).ToList();

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