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  2. Mathematics of bookmaking - Wikipedia

    en.wikipedia.org/wiki/Mathematics_of_bookmaking

    Fractional odds are written a − b (a/b or a to b), meaning a winning bettor will receive their money back plus a units for every b units they bet. Decimal odds are a single value, greater than 1, representing the amount to be paid out for each unit bet. For example, a bet of £40 at 6 − 4 (fractional odds) will pay out £40 + £60 = £100.

  3. Vigorish - Wikipedia

    en.wikipedia.org/wiki/Vigorish

    Under proportional vigorish, a "fair odds" betting line of 2.00/2.00 [b] without vigorish would decrease the payouts of all outcomes equally, perhaps to 1.95/1.95, once it was added. More commonly though, disproportional vigorish will be applied as part of the efforts to keep the amounts wagered balanced, such as 1. 90 /2.00, making the outcome ...

  4. Sports betting - Wikipedia

    en.wikipedia.org/wiki/Sports_betting

    Decimal odds of 2.00 are an even bet. UK format (fractional odds) are used by British bookmakers. They are the ratio of the amount won to the stake – the solidus "/" is pronounced "to"; for example, 7/1 is "seven to one". Fractional odds of 1/1 are an even bet. US format odds are the amount won on a 100 stake when positive, and the stake ...

  5. Spread betting - Wikipedia

    en.wikipedia.org/wiki/Spread_betting

    Spread betting is any of various types of wagering on the outcome of an event where the pay-off is based on the accuracy of the wager, rather than a simple "win or lose" outcome, such as fixed-odds (or money-line) betting or parimutuel betting. A point spread is a range of outcomes and the bet is whether the outcome will be above or below the ...

  6. Gambling - Wikipedia

    en.wikipedia.org/wiki/Gambling

    Fixed-odds betting and Parimutuel betting frequently occur at many types of sporting events, and political elections. In addition many bookmakers offer fixed odds on a number of non-sports related outcomes, for example the direction and extent of movement of various financial indices , the winner of television competitions such as Big Brother ...

  7. Teaser (gambling) - Wikipedia

    en.wikipedia.org/wiki/Teaser_(gambling)

    Bet on the over and the line is 39.5 (45.5 - 6). Bet on the under and the line is 51.5 (45.5 + 6). Many bettors like the teaser bet because it gives the bettor more cushion, but like a parlay, one must hit all aspects of the bet to win. There is still debate among experienced sports bettors if teasers are good wagers or not.

  8. Each-way - Wikipedia

    en.wikipedia.org/wiki/Each-way

    For the place part of the bet to give a return, the selection must either win or finish in one of the predetermined places for the event, such as first place or second place. The odds paid on the place part of the bet are usually a fraction (commonly 1 ⁄ 2, 1 ⁄ 3, 1 ⁄ 4 or 1 ⁄ 5) of the win odds. The trade-off being that one has a ...

  9. Orders of magnitude (probability) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude...

    odds of winning the Jackpot (matching the 6 main numbers from 49) in the UK National Lottery with one ticket until 10 October 2015 10 −7: 1.17×10 −7: Death per aircraft journey [10] 2.9×10 −7: Gaussian distribution: probability of a value being more than 5 standard deviations from the mean on a specific side [11] 8.0×10 −7