I heard this from my son's math camp. The answer is right.

来源: BigY 于 2011-12-09 11:25:53 [] [旧帖] [给我悄悄话] 阅读数 : (0 bytes)
回答: 99,约定单双数， 由 iwantall 于 2011-12-08 18:01:50
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