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是餘下的三分之一吧, 如果是,那麼式子就是2005*(1/2*2/3*3/4*……2004/2005),括弧裏可以連約,就變成1/2005,所以剩下1 (减一半就變成1/2,减三分之一就變成2/3,……减1/2005就是變成2004/2005),故有這個式子
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