Stɛp bay stɛp: wan ivintɛm wit $100 pan rɛd
Wan ɔndrɛd dɔla, chip dɛn we ɛni wan na fayv dɔla, rɛd ɛni spin, ɛn wan rul fɔ stɔp. Spin bay spin.

Wan ivintɛm we wi simyulet na layv tebul: te to 60 spin fɔ $5 pan rɛd frɔm $100 bɔjit, wit $50 lɔs limit ɛn $50 win limit. Di lɔs limit ɛnd am na spin 36. Di sɛshɔn sho aw varians de luk as i de apin, ɛn wetin mek di rul fɔ stɔp na di wan disizhɔn we mata.
Di plan
Ɛni bɛst rulɛt stratɛji de fɔ $100? Nɔn nɔ de we de briŋ di avrej kɔst dɔŋ. Da bɔjit de na mɔni we wi go ebul fɔ lɔs; wetin wi de pik na di bɛt mɔni ɛn di rul dɛn fɔ stɔp. Bɛt mɔni na $5, 5% pan di bɔjit, ɛn dat gi wi lɛk twɛnti bɛt fɔ lɔs na wi an. Lɔs limitstratɛjiLɔs limitƆmɔs lɔs we yu dɔn sɛt bifo, we yu go stɔp di sɛshɔn if yu rich am.Rid ɔl → na −$50 ɛn win limitstratɛjiWin limitPrɔfit tagɛt we yu dɔn sɛt bifo, we yu go stɔp di sɛshɔn if yu rich am.Rid ɔl → na +$50, ɛn wi disayd am naw. Lɔs we fɔ ɛkspɛktmatematiksLɔs we fɔ ɛkspɛktValyu we fɔ ɛkspɛkt tɛm ɔl di mɔni we yu bɛt; di avrej mɔni we yu de lɔs insay wan sɛshɔn ɔ wan tɛm.Rid ɔl → pan 60 spin na 60 × $5 / 37 = $8.11. Wi de ɛkspɛkt fɔ kɔmɔt wit lɛk $92, ɛn fɔ de ɛnisay bitwin $20 ɛn $170 wit prɔbabilitimatematiksPrɔbabilitiDi chans fɔ wan rizɔlt, frɔm 0 to 1 ɔ frɔm 0% to 100%. Wan nɔmba: 1/37 = 2.70%.Rid ɔl → we mek sɛns.
Spin 1–20
R B B R R 0 B R R B R B B B R R B R B R. Tɛn rɛdbɛtRɛdIvin-mɔni bɛt pan di 18 rɛd nɔmba. Na Frɛnch: rouge.Rid ɔl →, nayn blakbɛtBlakIvin-mɔni bɛt pan di 18 blak nɔmba. Na Frɛnch: noir.Rid ɔl →, wan zirowilZiroDi wan grin pɔkit we nɔ ivin-mɔni, dɔzin ɔ kɔlɔm bɛt nɔ kɔba; na usay di kasino advantej kɔmɔt. Dɛn kin kɔl am bak: wan ziro, 0.Rid ɔl →: +$50 − $45 − $5 = $0. Balans na $100. Di ziro na spin 6 kɔst wan chipmɔniChipTokɛn we min wan sɛt mɔni; yu put am na di bɛt tebul fɔ mek bɛt. Dɛn kin kɔl am bak: check.Rid ɔl →, ɛn wit 1/37 i kam smɔl ali. Natin ya nɔ strenj. Afta twɛnti spin, wi nɔ win nɔ lɔs.
Spin 21–36
B B B B B R B B R B B R B B B B. Fayv blak fɔ bigin, tatin ɔltogɛda: tri rɛd, tatin blak, +$15 − $65 = −$50. Balans na $50. Na dis kayn tɛm de mek pipul chenj dɛn bɛt, dɔbul am ɔ chenj kɔla. Di prɔbabiliti fɔ gɛt 13 blak ɔ mɔ insay 16 spin smɔl pas 1%; bɔt i bin fɔ apin to sɔmbɔdi da nayt de. Wi dɔn lɔs $50 frɔm di bigin, di lɔs limit bit na spin 36, ɛn wi grap.

Spin 37–60, we wi nɔ de
R B R B, dɔn R R B R 0 R B R R B R R B B R R B R B R. Fɔtin rɛd, nayn blak, wan ziro: if wi bin tinap, +$70 − $45 − $5 = +$20, ɛn balans fɔ $70 na spin 60. Tati-siks spin na layv tebul na lɛk 45 minit. Wi kɔmɔt wit $50, wi dɔn lɔs $50, ɛn di lɔs we fɔ ɛkspɛkt fɔ 36 spin na bin −$4.86. Tatin rɛd, twɛnti-tu blak, wan ziro.
- p10 −$100
- p25 −$100
- midul valyu −$100
- p75 +$0
- p90 +$70
Wetin apin
Wi pe lɛk $5 fɔ 45 minit rulɛt, plɔs $45 bad lɔk. Tatin rɛd insay 36 spin de wel ɔnda di 17.5 we fɔ ɛkspɛkt, ɛn nayn rɛd we nɔ rich di blak dɛn na −$45 bifo di ziro. Na variansmatematiksVariansWan mɛzhɔ fɔ aw di rizɔlt dɛn sprɛd rawnd di valyu we fɔ ɛkspɛkt. I ay fɔ bɛt pan wan nɔmba, i lɔ fɔ ivin-mɔni bɛt.Rid ɔl → disayd di ivintɛm; na di bɛt mɔni ɛn di spin dɛn disayd di prays; na di lɔs limit disayd wetɛm i ɛnd. If wi bin tinap, wi bin fɔ gɛt $20 bak na spin 60, ɛn dat nɔto rizin fɔ tinap: wetin kam bak na varians bak, ɛn na so di blak strik we kam bifo am bin bi.
Wetin wi nɔ du
Chenj di bɛt mɔni afta lɔs (dat na prɔgrɛshɔnstratɛjiPrɔgrɛshɔnƐni rul we de chenj di bɛt mɔni bay di rizɔlt dɛn we dɔn pas. Nɛgativ prɔgrɛshɔn de es am afta lɔs, pɔzitiv wan afta win.Rid ɔl →, ɛn i de mek ɔl di mɔni we yu bɛtmɔniƆl di bɛt mɔniƆl di mɔni we yu bɛt na wan sɛshɔn ɔ wan tɛm, wit di win mɔni we yu bɛt bak. Dɛn kin kɔl am bak: handle, action.Rid ɔl → go ɔp). Chenj kɔla afta di blak strik (di sem ɔds). Tinap pas 60 spin bikɔs wi “nia nɔ win nɔ lɔs” (dat na fɔ tɔk di lɔs limit bak). Bɛt pan di dɔzinbɛtDɔzin1–12, 13–24 ɔ 25–36, i de pe 2:1.Rid ɔl → we “nɔ bin kam yet” (di sem ɛj, difrɛn shep). Ɛni wan pan dɛn bin fɔ chenj di shep fɔ di ivintɛm, bɔt nɔn nɔ bin fɔ chenj di kɔst we fɔ ɛkspɛkt.
Kwɛstyɔn dɛn
Twɛnti chip na yu an instɛd fɔ tɛn. Di ivintɛm de go lɔng; di kɔst fɔ ɛni spin kɔt to af.
Lɔs we fɔ ɛkspɛkt na $4.05 instɛd fɔ $8.11. Yɛs.
Sayn fɔ natin. Tatin blak insay sikstin spin de apin lɛk wan ivintɛm pan 125.
Smɔl jok fɔ ɛz di maynd

Di bɛt mɔni ɛn di spin dɛn de sɛt di prays. Di wil sɛt aw yu fil.
Usay wi gɛt am frɔm
- Ethier, S. N. The Doctrine of Chances: Probabilistic Aspects of Gambling.