Pari lor enn sel nimero
Enn pari lor enn sel nimero dan roulet met enn zeton lor enn nimero. Gin pli rar lor latab ek pli gro peman, avek mem lavantaz kazino 2.70% ki tou lezot.

Peman ek probabilite enn pari lor enn sel nimero
Enn kaz lor 37 gagne: 1/37, ouswa 2.70%. Kazino-la pey 35:1. Enn peman zis lor 37 kaz ti pou 36:1; sa enn inite ki manke-la se lavantaz kazino.
EV par $1 = (1/37)(35) − (36/37)(1) = −1/37 = −$0.0270
Egzanp miz
Varyans
Pert atandi parey ki lor rouz, me dispersion rezilta pa parey. Par dolar mize, enn pari lor enn sel nimero ena enn ekar-tip apepre 5.84 kont 1.00 pou enn pari peman egal. Lor 100 tour a $10, enn zwer lor rouz dabitid res dan ±$100 lesperans; enn zwer lor enn sel nimero dabitid res dan ±$584.
Karakteristik
- Rezilta medyann enn sesion se enn pert regilie; mwayenn-la monte akoz bann gin 35:1 rar.
- Latant atandi pou enn gin se 37 tour, e latant-la souvan pli long ki laplipar dimounn panse: apre 37 tour ena ankor 36% sans pou pa gagne.
- Minimom latab pou bann pari andan dabitid pli ba par zeton, me souvan ena enn minimom total lor tou pari andan.
- Dan kazino stil franse, enn pari lor enn sel nimero apel plein.
Enpe riye

Mem pert atandi ki rouz, avek enn dispersion boukou pli large.