The key of this class of problem is to...
所在版块：求学狮城 发贴时间：2004-09-17 21:46

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... make use of a paradox. You can derive answers to similar problems by constructing a paradox of appropriate reference.
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Flying @way 吳穎暉
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A logical question(quite interesting one) － bloodmage 　2004-09-17 21:13 (430 bytes , 575reads )
Quite a classic one, I have to say. － Flying 　2004-09-17 21:44 (168 bytes , 508reads )
I think you are right. － bloodmage 　2004-09-18 00:08 (8 bytes , 311reads )
The key of this class of problem is to... － Flying 　2004-09-17 21:46 (121 bytes , 306reads )