This thread
https://bitcointalk.org/index.php?topic=1217368.0did a great job in finding out the +EV point of the Nitrogen dice jackpot. Now we have a similar challenge to work out the same thing for FortuneJack's new dice jackpot. It works differently.
The house edge is the same 1%
The min bet is 0.01฿
If you win you get 80% of the jackpot (50% if you bet 0.0001 and 20% if you bet 0.000001)
In order to win you have to roll a four figure number starting with a 1, then starting with a 2, then starting with a 3, through to 7. For example
17.65
27.65
37.65
47.65
57.65
67.65
77.65
Here is how FortuneJack explains it
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fi.imgur.com%2FD8qs2HU.png&t=663&c=CRo0rwpCUUdtig)
Thanks to BTF user ndnhc this is what we come up with
Bet amount : 0.01฿
Probability of rolling 1x.xx : 0.1
Probability of hitting the jackpot : 0.1^7
Number of rolls needed on average : 1/0.1^7 = 10000000
฿ wagered required on average : 100000
House edge : 1000฿
To be positive EV, the jackpot should be more than 1000/0.8 = 1250฿
Bet amount : 0.0001฿
Probability of hitting the jackpot : 0.1^7
Number of rolls needed on average : 1/0.1^7 = 10000000
฿ wagered required on average : 1000
House edge : 10฿
To be positive EV, the jackpot should be more than 10/0.5 = 20฿
Bet amount : 0.000001฿
Probability of hitting the jackpot : 0.1^7
Number of rolls needed on average : 1/0.1^7 = 10000000
฿ wagered required on average : 10
House edge : 0.1฿
To be positive EV, the jackpot should be more than 0.1/0.2 = 0.5฿.
The last one appears to be the most attractive option. What do yall think did we miss something? The first case of 1250฿ will probably never happen!
FWIW I used to find FortuneJack slightly shady but they have kept on improving and running an honest operation, I quite like them now. Here is a full review.
https://bitroll.com/bitcoin-dice-reviews/fortunejack-dice-review/Roll good.