Answer / k.prakashchandra

66 ( add 9 ,double ,add 9 ,double..... )

Answer / jenna branche

you take the 12 and and add the the two digits and you get 3 so u have (3, 3, ...) then you take 24 and add the two digits and you get 6 and the you take 33 and add the two digits so u have ( 3, 3, 6, 6 ...)then you take 66 and add the digits so you get 9 so the next number would be 75 because 7 plus 5 is 9.so you have (3, 3, 6, 6, 9, 9)

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