They are 90 percent correct they usually know which of the team will overcome.
A player can bet on the pair of 12 numbers by placing the chip on any one of several 3 blocks marked as 1st 12(1 to 12), 2nd 12(13 to 24), or 3rd 12(25 to 36). https://astradigital.co.uk/wiki/index.php?title=Rules_All_Of_Your_Know_For_That_Casino_Roulette_Game