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Buffon's needle problem, a probability experiment first posed by Georges-Louis Leclerc, Comte de Buffon in 1777, which demonstrates how the value of it (pi) can be estimated by dropping needles and observing the proportion that cross a line.

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The Buffon’s needle experiment says that if you drop N needles of length L onto a floor with strips of width 2L, the ratio of N and the number of needles across lines is approximately π [video by Tamás Görbe] [read more:

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