You have 13 balls which all look identical. All the balls
are the same weight except for one. Using only a balance
scale, can find the odd one out with only 3 weighings?
Is it possible to always tell if the odd one out is heavier
or lighter than the other balls?
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Answer Posted / kamran khan
13 balls are divide into four group (3,3,3,3,1)
1)First measure one pare of (3,3) . If it is equal then measure an other part
if it is also equal then last one is defective .
you suppose to first measure is unequal then unequal portion take and pick up on ball i.e(measure 1,1) and one is taken out if both are same then taken out ball is defective otherwise between two any one is defective
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