2010-03-24, 04:03 PM
This is the formula to determine the chance of getting a certain number of scrolls to work a certain number of times. It's not technically a MapleStory formula since it can be applied to pretty much anything with a success rate, but you would use this to find the chance of multiple scrolls working.
S^n*F^(t-n)*t!/(n!*(t-n)!) *100%
S= success rate
F= fail rate
n= number of times it succeeds
t = total number of tries
So an example, what's the chance of landing 7 60% scrolls on an overall?
.6^7*.4^(10-7)*10!/(7!*(10-7)!) *100%
there is a 21.599% chance of landing 7 60% scrolls. To find the chance of 7 or more scrolls working, you need to use the formula again for 8, 9, and 10 working and add the chances together.
S^n*F^(t-n)*t!/(n!*(t-n)!) *100%
S= success rate
F= fail rate
n= number of times it succeeds
t = total number of tries
So an example, what's the chance of landing 7 60% scrolls on an overall?
.6^7*.4^(10-7)*10!/(7!*(10-7)!) *100%
there is a 21.599% chance of landing 7 60% scrolls. To find the chance of 7 or more scrolls working, you need to use the formula again for 8, 9, and 10 working and add the chances together.