is this right?first: weigh 6 and 6 ball, leaving 1 ball: if balance, the left is the answer, if not, leave the heavier 6 balls for second step; second: weigh 2 and 2 balls out of 6 balls, leaving the other 2 if balance, choose the left 2 balls to third step; if not balance, choose the heavier 2 balls to third step; third: weigh the left 2 balls