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In gambling parlance, making a book is the practice of laying bets on the various possible outcomes of a single event. The phrase originates from the practice of recording such wagers in a hard-bound ledger (the 'book') and gives the English language the term bookmaker for the person laying the bets and thus 'making the book'.
The mathematics of gambling is a collection of probability applications encountered in games of chance and can get included in game theory.From a mathematical point of view, the games of chance are experiments generating various types of aleatory events, and it is possible to calculate by using the properties of probability on a finite space of possibilities.
Parlay bets are paid out at odds higher than the typical single game bet, but still below the "true" odds. For instance, a common two-team NFL parlay based entirely on the spread generally has a payout of 2.64:1. In reality, however, if one assumes that each single game bet is 50/50, the true payout should instead be 3:1.
When the free bet is placed the other bookmakers or betting exchanges are used to hedge all the possible outcomes so that no matter what happens the value of the free bet is retained. At its simplest, a matched bet involves placing a back bet using the free bet at a bookmaker while placing the opposing lay bet at a betting exchange .
Parimutuel betting, or pool betting, is a betting system in which all bets of a particular type are placed together in a pool; taxes and the house-take, or vigorish, are deducted, and payoff odds are calculated by sharing the pool among all winning bets.
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 ...
A session is a sequence of consecutive wagers made until 1 unit of profit is won. [2] Each session begins by betting 1 unit, and ends by winning 1 unit of profit. If the gambler loses, the session continues and the bet is repeated. Each time the gambler wins the game following a lost game, the bet is increased by 1 unit.
Arbitrage betting involves relatively large sums of money, given that 98% of arbitrage opportunities return less than 1.2%. [2] The practice is sometimes detected by bookmakers, who often hold an unfavorable view of it, [3] and in the past this could result in half of an arbitrage bet being canceled, or in extreme cases, even the closure of the bettor's account.