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Reshu Singh

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12 Identical Balls

The solution is confusing. Definitely not correct. In case 1-4 is heavier than 5-8, what is your second weigh?1,2,5 vs 3,7,12 or 1,2,5 vs 6,7,12? You seem to be switching between these combinations while explaining the second weigh. Either way, you wont be able to determine the odd ball with your answer.