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Title: Just a quick maths question Post by: kukushkin88 on March 05, 2010, 07:48:23 PM I'd be grateful if someone could help me out with this. In a tournament with 100 entrants how many matches would be required in total for everyone to play everyone else once? Title: Re: Just a quick maths question Post by: sovietsong on March 05, 2010, 07:49:57 PM 1
2 4 8 16 32 64 128 Title: Re: Just a quick maths question Post by: Ironside on March 05, 2010, 07:57:59 PM Title: Re: Just a quick maths question Post by: Ironside on March 05, 2010, 07:59:01 PM 99+98+97+.....................1
i make it about 5000 edit infact it should be exactly 5000 Title: Re: Just a quick maths question Post by: sovietsong on March 05, 2010, 07:59:25 PM think i've misunderstood the question. my bad Title: Re: Just a quick maths question Post by: hector62 on March 05, 2010, 07:59:46 PM 4,950
Title: Re: Just a quick maths question Post by: Ironside on March 05, 2010, 08:00:23 PM Title: Re: Just a quick maths question Post by: LeedsRhodesy on March 05, 2010, 09:07:56 PM Starting at One and counting up what is the first number to have the letter "A" in???? Title: Re: Just a quick maths question Post by: Ironside on March 05, 2010, 09:08:45 PM 1000
Title: Re: Just a quick maths question Post by: Ironside on March 05, 2010, 09:09:26 PM sorry 101
Title: Re: Just a quick maths question Post by: LeedsRhodesy on March 05, 2010, 09:13:28 PM Title: Re: Just a quick maths question Post by: Ironside on March 05, 2010, 09:17:25 PM one hundred and one Title: Re: Just a quick maths question Post by: sovietsong on March 05, 2010, 09:18:44 PM one hundred & one fyp Title: Re: Just a quick maths question Post by: Ironside on March 05, 2010, 09:20:53 PM one hundred & one fyp oops forgot he was from leeds Title: Re: Just a quick maths question Post by: Pawprint on March 05, 2010, 09:26:01 PM I'd be grateful if someone could help me out with this. In a tournament with 100 entrants how many matches would be required in total for everyone to play everyone else once? x= n2 - n 2 where x= Total number of matches required n= Number of entrants Title: Re: Just a quick maths question Post by: LeedsRhodesy on March 05, 2010, 09:33:25 PM I'd be grateful if someone could help me out with this. In a tournament with 100 entrants how many matches would be required in total for everyone to play everyone else once? x= n2 - n 2 where x= Total number of matches required n= Number of entrants X= 7 Title: Re: Just a quick maths question Post by: Free_Rollin on March 05, 2010, 10:19:26 PM This is essentially the handshake problem. Solution is as pawprint mentioned, which means 4950 matches.
Title: Re: Just a quick maths question Post by: kukushkin88 on March 05, 2010, 11:18:54 PM ty, much obliged
Title: Re: Just a quick maths question Post by: paulhouk03 on March 06, 2010, 05:10:09 AM you can work this out on a scientific calaulator
i think its the ncr button Title: Re: Just a quick maths question Post by: david3103 on March 06, 2010, 12:57:57 PM Sum of the digits problem - guy 1 has 99 matches, 2 has 98 etc so it's the sum of the digits to 99?
n(n+1)/2 99(100)/2 4950 Title: Re: Just a quick maths question Post by: Simon Galloway on March 06, 2010, 03:11:45 PM you can work this out on a scientific calaulator i think its the ncr button You can, but you don't really need to when one of the numbers is small. in this example, your ncr button is performing this calculation: 100!/(98!2!) which simply cancels down to [(100*99)/2] |