GuntisAndersons
Joined: Apr 25, 2019
• Posts: 1
April 25th, 2019 at 12:53:20 PM permalink
Roulete with 37 numbers in total! If I keep betting on same number again and again, what are my chances to not hit it in 100, 150, 200 and 250 spins?
OnceDear
Joined: Jun 1, 2014
• Posts: 4604
Thanks for this post from:
April 25th, 2019 at 1:06:57 PM permalink
Quote: GuntisAndersons

Roulete with 37 numbers in total! If I keep betting on same number again and again, what are my chances to not hit it in 100, 150, 200 and 250 spins?

Hi, and welcome to the forum.

a) (36/37)^100 = 6.457697 %
b) (36/37)^150 = 1.64103 %
c) (36/37)^200 = 0.4170185 %
d) (36/37)^250 = 0.1059727 %

It wouldn't make any difference if you kept betting on different numbers.
Take care out there. Spare a thought for the newly poor who were happy in their world just a few days ago, but whose whole way of life just collapsed..
7craps
Joined: Jan 23, 2010
• Posts: 1977
April 25th, 2019 at 2:35:09 PM permalink
Quote: GuntisAndersons

what are my chances to not hit it in 100, 150, 200 and 250 spins?

a) (36/37)^100 = about 1 in 16
b) (36/37)^150 = about 1 in 61
c) (36/37)^200 = about 1 in 240
d) (36/37)^250 = about 1 in 944

all these values are BEFORE one spin has happened.
once a spin or spins have happened the probability has changed.

take a) say 99 spins and NO # hit.
a) (36/37)^100 = about 1 in 16
the probability the next spin does hit is 1 in 37,
does NOT hit = 36/37 or about 97.3%
winsome johnny (not Win some johnny)