問題詳情
58. 惡魔島上的監獄有2020間牢房關犯人,編號分別為…、2020.適臨總統就職,實施特赦,獄方決定以下列方式來釋放部分犯人:
● 牢房開關按一次便打開,再按一次又關起來。
● 現在,從第 1 間開始算,只要是 1 的倍數,全部按一次;
● 然後,再從第 2 間開始,只要是 2 的倍數,再按一次。
● 依此類推,第 k 間開始,只要是 k 的倍數就再按一次。
● 如此一直到 2020 的倍數按完為止,仍開者便立即釋放。請問最後被釋放的共有多少人?
(A) 40
(B) 42
(C) 44
(D) 46
參考答案
無參考答案
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