Category: Math

(originally published September 17, 2009)

A funny thing happened in the Bulgarian national lottery this week: the same numbers were drawn as last week.

TheĀ BBC and the AP both report the odds at 1 in 4 million; ABC Australia calls it 1 in 14 million. People are demanding that the Bulgarian lottery perform an investigation because no one can believe the result. As it's not every day this sort of probability question comes up in the news, let's take a second to walk through the problem.

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