>>938046099
should be 2/3 because the remaining balls in the pool you can choose from are 1 green, 2 red

if you select a green ball at any point that trial is not counted since it specifically says you got a red ball, box A is not a part of the equation

you have 75% to get a red ball from boxes 2 and 3 because theres 3 red, 1 green