Eight pills one is poisonous and weights slightly more how can you find poisoned pill?
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weigh two groups of three pills each
if they weigh the same, the poison pill is in the group not yet weighed
If they weigh different, whichever pan has the heavier load of 3 pills contains the poison pill
Once you know which of the three groups has the poison pill:
Weigh two pills from that group
If they weigh the same, the poison pill is the one not being weighed
If they weigh different, the heavier pan has the poison pill
Done!
weigh two groups of three pills each
if they weigh the same, the poison pill is in the group not yet weighed
If they weigh different, whichever pan has the heavier load of 3 pills contains the poison pill
Once you know which of the three groups has the poison pill:
Weigh two pills from that group
If they weigh the same, the poison pill is the one not being weighed
If they weigh different, the heavier pan has the poison pill
Done!