# 1 in 13 chance streak help

• Feb 24th 2010, 10:33 PM
PeterC
1 in 13 chance streak help
Hello all,

It would be much appreciated if someone could help with an answer to this problem.

I will use this as an example.

A roulette wheel has 13 numbers, say i pick number 8, what is the chance that in 40 spins that number 8 won't show.

1 in ?

again, thank you for your time.
• Feb 24th 2010, 10:53 PM
matheagle
If they are indep spins and they seem to be

\$\displaystyle (12/13)^{40}\$
• Feb 25th 2010, 08:18 AM
PeterC

The calulator says the answer is 0.04069262906693

how would i convert that so i can see it as a 1 in 3,575 chance format as an example

This is specifically 1 number that won't show, and the same number for each spin.

I want number 8 to not come up 40 times, what are the odds for the number 8 to not show 40 times in a row out of 13 numbers.
• Feb 25th 2010, 07:50 PM
jprockbelly
Quote:

Originally Posted by PeterC
The calulator says the answer is 0.04069262906693

How accurate do you need it to be?

My calculator says that this number is close to 0.0407. My calculator also says that this is 407/10,000, so divide top and bottom by 407...

1/24.6