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There are 8 stones which are similar except one which is
heavier than the others. To find it, you are given a pan
balance. What is the minimal number of weighing needed to
find out the heaviest stone ?
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Answer Posted / prasaanth
The answer is 2, 3 balls on each of the pans of the
balancing scales, should the scales balance then from the
remaining 2, we can find the heavier ball through another
comparison which gives 2 comparisons, however in the first
place should the balance not balance, then from the heavier
group, pick 2 more balls (from 3) and weigh them, if the
scales balance then the remaining ball is the heaviest one
and if the scales do not balance then the one that is heavy
can be seen from that instant itself-- THUS THE MOST
OPTIMAL ANSWER IS "2"
| Is This Answer Correct ? | 5 Yes | 1 No |
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