10 February 2017 8 6K Report

I am trying to program a numerical vigilance test whereby 3 digit numbers will be presented randomly on the screen at a rate of 100 per min (this part I have managed to program). I need 8% of these to be duplicate numbers and appear twice in a row, but these duplicates need to be randomly selected so they are not the same each time. The participant then needs to respond as quickly as possible by hitting the spacebar when a duplicate appears. Any help would be appreciated!

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