generating random numbers without repeat

Hello,
i need some help to generate random numbers without repeating the last one. I made a Attribute called LastNumber and generate a random number with random(x,y), but how can i make a rule that says until random(x,y) is not = LastNumber => generate new number.
Thanks from a Newbee
i need some help to generate random numbers without repeating the last one. I made a Attribute called LastNumber and generate a random number with random(x,y), but how can i make a rule that says until random(x,y) is not = LastNumber => generate new number.
Thanks from a Newbee
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