The odds of the ball landing on any single number are 37 to
1.
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1/6 x 1/6 x 1/6 = 1/216 is the odds of getting three doubles in
a row so I suppose the odds of not rolling three in a row is
215/216 or 99.54% chance.
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There are many different ways to look to calculate the odds on
picking the perfect bracket. Attached is a article that lists many
of the different possibilities