question about KENO

orion

Experienced Member
PABnononaccred2
Joined
Nov 22, 2013
Location
deep south of Eu
Ok, I can admit it: I am a true disaster with maths. :(

I hope somebody here can be so kind helping me. Maybe it's a easy calculation, but I am not able to do it.

I was playing a combination of 6 numbers (let's say 1,2,3,4,5 and 6) and I did 115 spins in a row.
During these 115 spins ONE of the 6 numbers (let's say number 6) has NEVER been hit, not even once.

How many probabilities of such an event ?

(standard keno 80 numbers, of which 20 drawn per spin).
 

K2C

Webmeister
webmeister
Joined
Mar 17, 2014
Location
USA
Ok, I can admit it: I am a true disaster with maths. :(

I hope somebody here can be so kind helping me. Maybe it's a easy calculation, but I am not able to do it.

I was playing a combination of 6 numbers (let's say 1,2,3,4,5 and 6) and I did 115 spins in a row.
During these 115 spins ONE of the 6 numbers (let's say number 6) has NEVER been hit, not even once.

How many probabilities of such an event ?

(standard keno 80 numbers, of which 20 drawn per spin).

P(A specific number not drawn in a single round) = 60/80 = 3/4 = 0.75
P(A specific number not drawn in 115 rounds) = 0.75^115 = 4.3 E-15 - that's small
P(ONE of the 6 numbers not drawn in 115 rounds) ~ 6* 4.3 E-15 = 2.6 E-14 that's still small.

You have logs? Screenshots?
 

orion

Experienced Member
PABnononaccred2
Joined
Nov 22, 2013
Location
deep south of Eu
Thank You K2C !!!

yes I have got something recorded but so far I am keeping it for myself, since first I would like to understand if such a situation can still be considered as "bad luck".

Because this is what the casino told me (by written btw).
 

K2C

Webmeister
webmeister
Joined
Mar 17, 2014
Location
USA
Thank You K2C !!!

yes I have got something recorded but so far I am keeping it for myself, since first I would like to understand if such a situation can still be considered as "bad luck".

No that's not bad luck. That's either you having missed something or the game being rigged/broken. And based on my experience I would bet on the former (no offense).

Because this is what the casino told me (by written btw).

That does not add to your story at all. Every casino's CS gets dozens of whining emails about loosing streaks of sorts and they just respond to those from the script without bothering to read into details.
 

spintee

Ueber Meister
webby
mm2
Joined
Mar 21, 2012
Location
Northants
That is terrible odds, Thats not being unlucky,
Only other day I signed up to a mobile phone casino, Got free 5£ played (21s) at 50p ago I played elven hands as won once, The dealer got 4x 21 ace and picture & another 3, 21s with xtra card, and won all the rest of games, Now if that's not fixed I do not no what is
 
Top