2019 (c)Shogo Baba
Turn a roulette with 10 numbers from 0 to 9 one thousand times and count how many times 9 appears. The probability of having 9 is 10%, which most likely appears 100 times in total.
ROULETTE: 101
9 appears: 15
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2018
Appeared in the Bulletin "New-Method" No. 66