有紅、綠、藍三種不同顏色、不知材質的小球各一對。每一對外觀相同，都有一顆較重的小球和一個較輕的小球，而且該重量差距極小，無法光靠人體感官判斷出來。已知三種顏色中較重的小球都一樣重，較輕的也都一樣輕。現在給你一個天秤，再給你2次使用天秤的機會，請你把這些球中較輕的球分類出來。
解答(想要解密請聯絡作者)：
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