Generate random list without duplicates

I simply don't understand why - bacause you can just delete Random column after sorting... But if you don't want see that step as separate column - you can merge that steps into 1 for example: 

let
    Source = Table.FromList({1..13}, Splitter.SplitByNothing(), type table[Numbers = Int64.Type]),
    Randomized = Table.RemoveColumns(Table.Sort(Table.AddColumn(Source, "Random", each Number.Round(Number.RandomBetween(1, 100), 0), Int64.Type),{{"Random", Order.Ascending}}),{"Random"})
in
    Randomized