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2026
Seven cubes are identical in shape. Out of these, the weight of each of the six cubes is equal and the weight of the remaining cube is less than the weight of any other cube. A balance is used to identify the lightest cube. What is the minimum number of attempts required to distinguish the odd cube with certainty?
Explanation
To identify the lightest cube among the seven, first, weigh three cubes against three others. If they balance, the lighter cube is the remaining one; if they don't balance, the lighter side contains the odd cube. Weigh any two of the suspected lighter cubes to identify the lightest one, achieving the goal in just two attempts.
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