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| Odd-Number Bet |
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A wager that one of the odd numbers will win the next spin.
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| Odds |
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The likelihood of an event happening.
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| Orphans / Orphelins |
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It's a bet on three specific numbers 6, 34 and 17 that are neighbors on the wheel, but far apart on the layout. This is a French phrase which is common in European casinos.
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| Outside Bet |
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One of the 2-to-1 or even-money bets found on the outside of the roulette layout: Red, Black, Odd, Even, High or Low.
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