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Permutation Calculator.
As you are aware there are many different types of bets, and many different combinations within selections, These will be made easier to understand and work out using this App, The App helps you to work out the many different combinations of possibilities there are depending on your number of selections, then the Calculator part will tell you your expected Returns, Profit and Outlay. E.G.

3 selections means Bet1, Bet2, Bet3

The different combinations in these 3 selections are :

3 Singles
Bet1 1
Bet2 2
Bet3 3

3 Doubles
Bet1 & Bet2 1
Bet2 & Bet3 2
Bet1 & Bet3 3

1 Treble
Bet1 & Bet2 & Bet3 1


This equals a total a total of 7 possible combinations , covering all 7 Bets (Combinations) from 3 selections is called a Patent.
Bet combinations used in this App are as Follows:-

Trixie : Selections = 3 Number of Bets= 4
"1,2,3"
"1,2"
“1,3"
"2,3"

Patent: Selections = 3 Number of Bets= 7
"1,2,3"
"1,2"
"1,3"
"2,3"
"1"
"2"
"3"

Yankee: Selections = 4 Number of Bets= 11
"1,2,3,4"
"1,2,3"
"1,2,4"
"2,3,4"
"1,3,4"
"1,2"
"1,3"
"1,4"
"2,3"
"2,4"
"3,4"

Lucky15 : Selections = 4 Number of Bets= 15
"1,2,3,4"
"1,2,3"
"1,2,4"
"2,3,4"
"1,3,4"
"1,2"
"1,3"
"1,4"
"2,3"
"2,4"
"3,4"
"1"
"2"
"3"
"4"

Accumulators are 1 Bet that incorporates all selections (Stake * Bet1 + Stake equals the stake for Bet2 etc.) e.g.

Stake = 2, Bet1 = 5/1, Bet2 = 6/1

Stake * Bet1 = Total + Stake = Total Returns
(2 * 5) = 10 + 2 = 12

Stake * Bet2 = Total + Stake = Total Returns
(12 * 6) = 72 + 12 = 84

84 then becomes the stake for Bet3 etc.