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  2. Fixed-odds betting - Wikipedia

    en.wikipedia.org/wiki/Fixed-odds_betting

    For example, the 4-to-1 fractional odds shown above is the same as 5 in decimal odds, while 1-to-4 would be quoted as 1.25. The method for converting moneyline to decimal odds depends on whether the moneyline value is positive or negative. If the moneyline is positive, it is divided by 100 and add 1.

  3. Odds - Wikipedia

    en.wikipedia.org/wiki/Odds

    Decimal odds are favoured by betting exchanges because they are the easiest to work with for trading, as they reflect the inverse of the probability of an outcome. [13] For example, a quoted odds of 5.00 equals to a probability of 1 / 5.00, that is 0.20 or 20%. Decimal odds are also known as European odds, digital odds or continental odds. [9]

  4. Mathematics of bookmaking - Wikipedia

    en.wikipedia.org/wiki/Mathematics_of_bookmaking

    For example, a bet of £40 at 6 − 4 (fractional odds) will pay out £40 + £60 = £100. The equivalent decimal odds are 2.5; £40 × 2.5 = £100. We can convert fractional to decimal odds by the formula D = (b + a) ⁄ b. Hence, fractional odds of a − 1 (ie. b = 1) can be obtained from decimal odds by a = D − 1.

  5. Dutching - Wikipedia

    en.wikipedia.org/wiki/Dutching

    Over 2.5 - odds of 2.1 at Bookmaker 1 Under 2.5 - odds of 1.95 at Bookmaker 3 Sum of Reciprocals = 1 Decimal Odds at Bookmaker 1 + 1 Decimal Odds at Bookmaker 3 = 1 2.1 + 1 1.95 = 0.476 + 0.513 = 0.989 {\displaystyle {\begin{aligned}{\text{Sum of Reciprocals}}&={\frac {1}{\text{Decimal Odds at Bookmaker 1}}}+{\frac {1}{\text{Decimal Odds at ...

  6. 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 15) of the win odds. The trade-off being that one has a ...

  7. How are point spreads made for NFL games? Veteran Vegas ... - AOL

    www.aol.com/sports/point-spreads-made-nfl-games...

    The first spread Andrews comes to for an NFL game is simple math, using the power ratings: If Team A is 90, Team B is 91 and at home with a 2.5-point home-field advantage, the line is Team B -3.5.

  8. Lottery mathematics - Wikipedia

    en.wikipedia.org/wiki/Lottery_mathematics

    Since ,, =,, the probability of obtaining the score of 2 and the bonus ball is , = = %, approximate decimal odds of 1 in 81.2. The general formula for B {\displaystyle B} matching balls in a N {\displaystyle N} choose K {\displaystyle K} lottery with one bonus ball from the N {\displaystyle N} pool of balls is:

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