100盞燈

This item was filled under [ 測驗 ]
有100盞燈
分別寫上編號1~100

同樣地 有100個燈制
寫上編號1~100

當我按1號燈制
寫上1既倍數既燈 會開/關(如果燈開著 就關,相反地,關著就會開)
當我按2號燈制
寫上2既倍數既燈 會開/關
如此類推

如果一開始所有燈都關著
當我每個燈制都按一下之後
會有幾多個燈會開著?佢地既編號又係幾多?

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