無解

_________________
數學好好玩

要依據"開"和"關"動作的速度而定

如果假設燈的開關是自動設定的呢?...或是電腦控制?

_________________
If I were assured of the former eventuality I would, in the interests of the public, cheerfully accept the latter.

應該要加上前提
不考慮開關時間

_________________
數學好好玩

就算是不考慮應該也不會有人知道答案才對...

_________________
If I were assured of the former eventuality I would, in the interests of the public, cheerfully accept the latter.

這個問題是1970年英國哲學家J. Thomson 提出的例子，說明數學中有些問題是不可判定的。
孫文先敬上

_________________
孫文先 敬上

_________________
數學好好玩

以此方法不可能算到二分鐘.
頂多趨近2分而已.
所以答不成立.

不能把方法和時間連結啊...
時間終究會到的...所以不是關就是開

_________________
If I were assured of the former eventuality I would, in the interests of the public, cheerfully accept the latter.

開關切換的也太快了吧！