Forums

General Betting

Welcome to Live View – Take the tour to learn more
Start Tour
There is currently 1 person viewing this thread.
Duval
04 Mar 10 21:53
Joined:
Date Joined: 22 Feb 03
| Topic/replies: 5 | Blogger: Duval's blog
I used to be able to do this but have lost an old spreadsheet and can't remember how I got the formula

I want to calculate a dutch lay on three horses say at 3.0 5.0 & 8.0 so that my total liability is exactly £100 for all three. I know that those totals added together is approx 2.47 (i can work that out) but can't get the liability right.

Any takers to ease my pain?
Pause Switch to Standard View Another maths question
Show More
Loading...
Report Duval March 4, 2010 10:11 PM GMT
Sorry, odds are 5 8 & 13

Dutched price is 2.49
Report bongo March 4, 2010 10:40 PM GMT
Assuming the numbers 5,8 and 13 are in cells A1,A2,and A3 then
=1/(1/A1+1/A2+1/A3)
gives you the answer
Report Duval March 4, 2010 10:48 PM GMT
Thanks for the reply bongo but as I said I know how to get that answer, it's the stake that I need to work out so that if I put £33.44 on H1 and £20.90 on H2 and £12.86 on H3 then my total liability on all three is £100 - it's getting those wages that I am struggling on
Report Duval March 4, 2010 11:12 PM GMT
I worked it out! it doesn't look good but it goes like this
if
Cell L5=5
Cell L6=8
Cell L7=13
Then
=100/(((100+(100/(L6/L5))+((100/(L6/L5))/(L7/L6)))*(1/(1/L5+1/L6+1/L7)-1))/100)
gives me £33.440514 to lay on the first Horse
I can work out the other stakes from there.
But if anyone else can make it easier I would appreciate it
Report Bayes. March 4, 2010 11:30 PM GMT
If x, y and z are the odds....

then...

b = 100xz/(z((x-1)(y-1)-1)-xy)
Report Bayes. March 4, 2010 11:33 PM GMT
I guess a and c follow symmetrically
Report Bayes. March 4, 2010 11:35 PM GMT
ie. numerators are a=100yz... and c =100xy... (denominator the same)
Report Duval March 5, 2010 11:33 PM GMT
Thanks Bayes

That did the trick cheers
Post Your Reply
<CTRL+Enter> to submit
Please login to post a reply.

Wonder

Instance ID: 13539
www.betfair.com