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djatc
djatc
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October 30th, 2017 at 2:06:36 PM permalink
Does anyone have a resource for a program or a website that can give you all possible round robin combinations? I want to be able to put the number or team into a bank of choices, and have the program spit out choices of multiple legs.

My google searches just come up with explanations of what a round robin is, or tables with possible bets based on legs.
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mustangsally
mustangsally
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October 31st, 2017 at 9:36:24 AM permalink
william hill mobile app does something like what you seek
it does not show you the teams involved past the initial selections

see mine for today college football games

*****
one can use
http://www.mathsisfun.com/combinatorics/combinations-permutations-calculator.html

you have to enter the values
then select list them
example
5 choose 2

5 choose 3


hope for help
Sally
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wudged
wudged
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November 1st, 2017 at 6:03:19 AM permalink
http://textmechanic.com/text-tools/combination-permutation-tools/combination-generator/

change "repeat objects" to No and delimit objects to (space)
AZDuffman
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June 27th, 2022 at 4:39:43 PM permalink
Not starting a new thread for a simple question so will revive an old one.

What is the fast way to find how many combinations you will have on a round robin? Say I want a 6 teamer and want to know how many possible 2 team combos? Or how many 4? I know it is probably simple.
All animals are equal, but some are more equal than others
unJon
unJon
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June 27th, 2022 at 5:09:14 PM permalink
Quote: AZDuffman

Not starting a new thread for a simple question so will revive an old one.

What is the fast way to find how many combinations you will have on a round robin? Say I want a 6 teamer and want to know how many possible 2 team combos? Or how many 4? I know it is probably simple.
link to original post



Mostly simple. It’s a Chose formula. 6 Choose 2 for first. 6 Choose 4 for second. The formula for X Choose Y is:

C (X,Y)= X!/(Y! * (X-Y)!)

So 6 Choose 2 = C (6,2)= 6!/(2! * (6-2)!)
6! = 6*5*4*3*2*1 = 720
4! = 4*3*2*1 = 24
2! = 2*1 = 2
So you get 720 / (2 * 24) = 15

6 Choose 4 = C (6,4)= 6!/(4! * (6-4)!) = 15 also.

ETA: fixed formula
Last edited by: unJon on Jun 28, 2022
The race is not always to the swift, nor the battle to the strong; but that is the way to bet.
AZDuffman
AZDuffman
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June 28th, 2022 at 2:52:14 AM permalink
Quote: unJon



C (X,Y)= X!*(Y! * (X-Y)!)

So 6 Choose 2 = C (6,2)= 6!/(2! * (6-2)!)
6! = 6*5*4*3*2*1 = 720
4! = 4*3*2*1 = 24
2! = 2*1 = 2
So you get 720 / (2 * 24) = 15

6 Choose 4 = C (6,4)= 6!/(4! * (6-4)!) = 15 also.
link to original post



Am I reading this wrong? On the formula on top you have X! multiplying what comes after but when you show the work you appear to be dividing?
All animals are equal, but some are more equal than others
unJon
unJon
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DieterAZDuffman
June 28th, 2022 at 3:49:28 AM permalink
Quote: AZDuffman

Quote: unJon



C (X,Y)= X!*(Y! * (X-Y)!)

So 6 Choose 2 = C (6,2)= 6!/(2! * (6-2)!)
6! = 6*5*4*3*2*1 = 720
4! = 4*3*2*1 = 24
2! = 2*1 = 2
So you get 720 / (2 * 24) = 15

6 Choose 4 = C (6,4)= 6!/(4! * (6-4)!) = 15 also.
link to original post



Am I reading this wrong? On the formula on top you have X! multiplying what comes after but when you show the work you appear to be dividing?
link to original post



Thanks. Fixed formula above. It’s divided by.
The race is not always to the swift, nor the battle to the strong; but that is the way to bet.
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