The question asks to identify the ball, but

來源: ffppyy 於 2012-12-31 17:22:56 [] [舊帖] [給我悄悄話] 閱讀數 : (83 bytes)
回答: 13球稱重問題的解答是什麽？ 由 texastrader 於 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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