George asked in Games & RecreationGambling · 6 months ago

Say you are playing roulette, and you are playing just red or black what are the chances you will loose twice in a row?

excluding zeros.

3 Answers

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  • 6 months ago

    its a fifty fify chanch do win or lose but to lose twice in a row is a slightly more probable

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  • 6 months ago

    It depends how many spins you play. If you only play two spins and leave, it's 1/4 (pretending there are no zeros like you requested). If you play 10 spins it's 86%. If you play 25 spins it's 99.4%.

    With zeros it's even worse of course. Playing 2 spins it becomes 27.7% and playing 10 it's 88.8%.

    For anyone curious about the formula, go to Arxiv and search for "The Probability of a Run" by Villarino. (I tried to link it but Yahoo's bot seems to classify all links as spam now.)

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  • 6 months ago

    You have a 1 in 2 chance of losing once, and a 1 in 2 chance of losing the second time. Multiply those and you get 1 in 4 or 0.25.

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