There are 38 numbers on a roulette wheel - 1 through 36 and 0 and 00. Therefore, you have a 1 in 38 chance of winning if you place your bet on a single number. Some casinos do not have the double zero. Therefore, your odds change to 1 in 37.
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There are two types of roulette wheels, one with a 0 and another with a 0 AND 00.In the first case, the probability will be 0.324 and in the second it will be 0.316, approx.
It is 13.2%
Forgetting about the zero for simplicity, it is (1/2) to the power 11, or 1/2048.
The second part of the question is not specific enough. Is it 3 on the roll of a die, a spin of a spinner, a card from a deck, a roulette wheel?
The second part of the question is not specific enough. Is it 2 on the roll of a die, a spin of a spinner, a card from a deck, a roulette wheel?