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這組的規律就是從第二個1開始,後一個數减去前一個數的差為這兩個數之前的那個數,即分別為1,1,2,3,5,8,13…… 那麼,每5個數一組,第5個數的個位數就會是5或者0,那麼前100個數裏就會有20個數是5的倍數.
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