weighing two groups to find a difference or not, then deducing to toss out the even groups, or the lighter group & the one left out of the weigh in...
then you set one on each side, leaving one out... again looking for a difference or a balance, tossiing out the balacing bears, or the lighter & the left-out one, determining the final bear!
with 9, you seperate them into 3 bunches of 3...
weighing two groups to find a difference or not, then deducing to toss out the even groups, or the lighter group & the one left out of the weigh in...
then you set one on each side, leaving one out... again looking for a difference or a balance, tossiing out the balacing bears, or the lighter & the left-out one, determining the final bear!