The probability of an event not happening is equal to (1 - the probability of the event happening). In this case, if you have a 1/20 chance of hitting the event, then the probability of not hitting it is 1 - 1/20 = 19/20.

In North American racing, the three most common ways to bet money are to win, to place, and to show. A bet to win, sometimes called a "straight" bet, means staking money on the horse, and if it comes in first place, the bet is a winner. In a bet to place, you are betting on your horse to finish either first or second.

Wagers paid out $32.42 on aR$2 bet to win,R$14.58 to place andR$9.08 on the horse. Two Phil's, the Jeff Ruby Steaks winner, paidR$10.44 andR$6.52. Angel of Empire, the 4-1 post-time favorite, finished third with a late charge and paidR$4.70.

For example, if you're playing aR$1 double using one horse in each race, the cost is 1x1x1=$1. If you're using two horses in each leg of aR$5 double, the cost is 2x2x5=$20. Armed with this basic knowledge, let's examine a few strategies for playing the double.