ruled length 中文意思是什麼
ruled length
解釋
規定長度-
If a needle is thrown at random on a sheet of paper ruled with lines whose distance apart is exactly equal to the length of the needle, how often can it be expected to fall on a line and how often into a blank space
如果一根針隨機的扔到一張橫格紙上，橫格之間的距離等於針的長度，那麼針落於一條線或落到空白處的概率是多少？
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