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LOSING STREAKS 

A mathematician has done some work on these losing runs, based on the average % of winning bets usually made.

Note: these are not set in concrete but are a reasonable guide as to what you may expect to happen from time to time.

 

"Usual" percentage of winning bets

"Average" Possible Losing Run

"Worst" Possible losing Run

50%

4 to 5

12 to 14

40%

6 to 7

18 to 20

33%

9 to 12

26 to 37

25%

16 to 18

48 to 55

20%

25 to 28

75

15%
40
110 to 120

Obviously, you will hit these average and worst case scenario losing runs now and again. How often will it happen? Don't know. Nobody does.
It's why it's called gambling. However you select your winners, work out your average hit rate and change your staking plan according to what you
may expect to happen in order to limit the damage.