There are 9 balls in which 8 balls are of same weight but 1 ball weight is less than them. You have weighing scale which u can use just 2 time . Then how will you know that which one is having less weight among them.[ Weighing scale is of rope]
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Divide the 9 balls into 3 groups of 3. Compare the weight of two of those groups.
The heavier group should then be obvious, it will either tip the scales, or, if the scales stay balanced, then it is the group you didn't include.
Now, choose 2 balls from this group and compare their weights, and using the same logic as before, the heavier ball will be obvious.
The heavier group should then be obvious, it will either tip the scales, or, if the scales stay balanced, then it is the group you didn't include.
Now, choose 2 balls from this group and compare their weights, and using the same logic as before, the heavier ball will be obvious.
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