gaz1 Posted December 13, 2009 Share Posted December 13, 2009 http://www.regiftable.com/regiftingrobinpopup.html Link to comment Share on other sites More sharing options...
SupraStar 3000 Posted December 13, 2009 Share Posted December 13, 2009 It didnt work with me. But then again, I failed GCSE maths Link to comment Share on other sites More sharing options...
Homer Posted December 13, 2009 Share Posted December 13, 2009 No matter what number you choose it will always select the same few posibilities on the grid (since there is a limited number of 'answers'), i.e. it's impossible for it to be wrong Link to comment Share on other sites More sharing options...
stevie_b Posted December 13, 2009 Share Posted December 13, 2009 You will end up with a number that is a multiple of 9. Notice how the multiples of 9 have all the same object associated with them! The others are just put there as "noise" to fool you. Let x be the tens of units you pick, and y be the single-digit units. E.g. if you pick 25 as a starting number, x=2 and y=5. Your starting number is 10x+y. Now minus each digit to get your final number: 10x+y - x - y = 9x x must be an integer greater than 0 (otherwise your starting number would only be 1 digit, which breaks the rules) and less than 10, so your final number will always be a multiple of 9. Simples Link to comment Share on other sites More sharing options...
Homer Posted December 13, 2009 Share Posted December 13, 2009 That's better explained Steve I remember this being one of the (simpler) homework assignments I had to do for GCSE maths all those years ago! Link to comment Share on other sites More sharing options...
gaz1 Posted December 13, 2009 Author Share Posted December 13, 2009 ahh i see Link to comment Share on other sites More sharing options...
Lee P Posted December 13, 2009 Share Posted December 13, 2009 Kinda freaky though Link to comment Share on other sites More sharing options...
AndrewOW Posted December 13, 2009 Share Posted December 13, 2009 It's very clever, and will entertain stupid people for a long time. I've been playing for several hours now, and it's confusing the hell out of me! Link to comment Share on other sites More sharing options...
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