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Title: (CLOSED) 0.01BTC for some math help :) Post by: elgreco on April 10, 2014, 08:51:45 PM First person with a functional answer gets 0.01BTC
Problem: I need a one line expression to edit a python script I use. I need to know the number of 3 number combinations in a data set when order does not matter. The expression I'm currently using for the number of 2 number combinations is this: Combinations = ((Numbers_In_Set-1)/2)*Numbers_in_set That works perfectly. But now I need to know how many 3 number combinations there are. The answer has to be in a one line form that I can use in my python script and match the results given by this website: http://stattrek.com/online-calculator/combinations-permutations.aspx (http://stattrek.com/online-calculator/combinations-permutations.aspx) Thanks! Title: Re: 0.01BTC for some math help :) Post by: Crossbow376 on April 10, 2014, 09:01:59 PM It would be n * (n-1) * (n-2) / 6
Title: Re: 0.01BTC for some math help :) Post by: Crossbow376 on April 10, 2014, 09:03:23 PM For the details, you can find everything (generalization, example, reasoning, etc) here. http://en.wikipedia.org/wiki/Combination
Title: Re: 0.01BTC for some math help :) Post by: elgreco on April 10, 2014, 09:09:40 PM That was perfect!!! Thx!!! Post an addy!
Title: Re: 0.01BTC for some math help :) Post by: Crossbow376 on April 10, 2014, 09:10:56 PM That was perfect!!! Thx!!! Post an addy! Thanks. :) Bitcoin address: 15eUuxpUmrrWtLM2vvnJ66SebyWXBwnArR Title: Re: 0.01BTC for some math help :) Post by: elgreco on April 10, 2014, 09:14:35 PM Thanks again!
https://blockchain.info/tx/7d7ec86abc1b61f8656fa84ea36805e90d885fb3613621b7b17b1c9c666e1b02 |