So you have to select one element in the array? Not that it makes much sense, but you should then OR it with the result from the three numerics.
I don't get the use of the ptbypt function. It would be simpler to have an event structure with a 'submit' button and in that event, check to see if the combination or array selection is correct.
Maybe you want one 'Correct' button and another 'Incorrect' button that you can flash. Your statement about flashing the single button and your existing control would make it just turn from either Green to Red or Red to Green.
