The question asks to identify the ball, but

来源: ffppyy 于 2012-12-31 17:22:56 [] [旧帖] [给我悄悄话] 阅读数 : (83 bytes)
回答: 13球称重问题的解答是什么？ 由 texastrader 于 2012-12-31 12:43:15

doesn't require the answer to specify if the bad ball is lighter or heavier.

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