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We can find defective bottle in only one weight:
- singh.durgesh2011 October 30, 20191. Put 2 bottle at one side and remaining 2 at another side of weight machine.
2. One side will heavy and another side will be less.(due to one of them have less weight)
3. Remove one and one bottle form both side.(one from left and one from right side of weight machine)
4. If remaining bottle on weight machine are equal.
5. Removed bottle form less weight side will be defective.
6. Else remaining bottle on weight machine will show the defective bottle.