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Navek
Joined: 01/06/2008 Posts: 2656
Message Posted: 18/11/2008 19:29  Join or Login to Reply  Message 1 of 22 in Discussion 
 1) Go to the link below. After reading each window, click on the boy in the lower right corner of the picture. 2) In the last window type in your answer in the white box using the keyboard (there is NO cursor). 3) Watch the paper in the boy's hand. You will be amazed . . and no, I don't know how it's done. http://digicc.com/fido 
TheWicks
Joined: 27/05/2007 Posts: 2279
Message Posted: 18/11/2008 19:43  Join or Login to Reply  Message 2 of 22 in Discussion 
 Navek I'm impressed it's very clever. P 
PtePike
Joined: 20/05/2008 Posts: 2334
Message Posted: 18/11/2008 19:50  Join or Login to Reply  Message 3 of 22 in Discussion 
 Last time I saw Fido Dido must have been on an 80s Tshirt saying "Spliff me up". I went for a threedigit number and it didn't work for me as I ended up with only one digit. Have I f***** up, or did I outsmart it...? 
Treesy
Joined: 14/08/2008 Posts: 406
Message Posted: 18/11/2008 20:20  Join or Login to Reply  Message 4 of 22 in Discussion 
 its something to do with the sum of the final 4 digits equaling 9 ie if u r left with 008 then must be 1 as 0+0+8+1 = 9 
Treesy
Joined: 14/08/2008 Posts: 406
Message Posted: 18/11/2008 20:24  Join or Login to Reply  Message 5 of 22 in Discussion 
 basically when u subtract the digits always add to 9 i.e if 99 9+9 = 18 but 1+ 8 = 9 reduced numbers this is called and its always 9 so u can always guess missing number ohhhhh im gooood 
scampy
Joined: 15/01/2008 Posts: 982
Message Posted: 18/11/2008 20:27  Join or Login to Reply  Message 6 of 22 in Discussion 
 That was good.............. 
Treesy
Joined: 14/08/2008 Posts: 406
Message Posted: 18/11/2008 20:47  Join or Login to Reply  Message 8 of 22 in Discussion 
 if your answer is 70 then 7+0 = 7 so to make 9 you need 2 more so answer is 2 as 7 + 0 + 2 = 9 if your answer is 88 then 8+8=16 and 1+6 = 7 you need 2 more to make 9 as 8 + 8 + 2 = 18 and then 1 + 8 = 9 hope that makes sense 
elko2
Joined: 24/07/2007 Posts: 4400
Message Posted: 18/11/2008 20:59  Join or Login to Reply  Message 9 of 22 in Discussion 
 Now I know enough to play with someone and amaze but I have not come up with a full explanation. Let us use three digits to start with. If after sub traction I get 270 and I circle 2, the result I type will be 70. 7 + 0 = 7 and we need 2 to complete to 9, hence the circled number is 9. In another trial with three digits I got the result as 288 and if I circle 2 again, the remaining number that I have to type is 88 i.e. 8 + 8 = 16 which requires 2 to complete it to a multiple of 9, hence the cicled number was 2. Wtith four digit example, if the result is say 856 and I circle 6, the result to type is 85 i.e.8+5=13 and that requires 6 to complete it to a multiple of 9, hence the circled number was 6. Now we are ready to play and amaze people. The difficult thing was to create the problem rather than solve it. Nice one. ismet 
elko2
Joined: 24/07/2007 Posts: 4400
Message Posted: 18/11/2008 21:01  Join or Login to Reply  Message 10 of 22 in Discussion 
 Treesy, You were right, my apologies. I did not look at your answer colsely. ismet 
teatime
Joined: 20/10/2008 Posts: 852
Message Posted: 18/11/2008 21:02  Join or Login to Reply  Message 11 of 22 in Discussion 
 Whst's all this about 9? My answer was 6. Or am I being thick? 
elko2
Joined: 24/07/2007 Posts: 4400
Message Posted: 18/11/2008 21:08  Join or Login to Reply  Message 12 of 22 in Discussion 
 Teatime, Oh dear dear, when you subtracted the two numbers and cicled one of them, what was the reamaining number? You tell us and we will tell you the number you circled? Is that ok? ismet 
Treesy
Joined: 14/08/2008 Posts: 406
Message Posted: 18/11/2008 21:13  Join or Login to Reply  Message 13 of 22 in Discussion 
 Elko2 no probs  but what i cant explain at this moment is why it always equals 9 when u subtract same 4 digits but in different order  my brain remembers something about it from years back but cant think right now  
teatime
Joined: 20/10/2008 Posts: 852
Message Posted: 18/11/2008 22:06  Join or Login to Reply  Message 14 of 22 in Discussion 
 Elko2 408 
rocky
Joined: 17/10/2007 Posts: 1749
Message Posted: 18/11/2008 22:09  Join or Login to Reply  Message 15 of 22 in Discussion 
 who really cares 
elko2
Joined: 24/07/2007 Posts: 4400
Message Posted: 18/11/2008 23:19  Join or Login to Reply  Message 16 of 22 in Discussion 
 msg. 14 Teatime, The number you circled was 6. 4+0+8= 12; 1+2=3, thus you need 6 to complete it to 9. As simple as that. ismet 
Groucho
Joined: 26/04/2008 Posts: 7993
Message Posted: 19/11/2008 07:51  Join or Login to Reply  Message 17 of 22 in Discussion 
 So the mathematical rule is that for 3 or 4 digit numbers when you jumble them up and subtract the lesser from the greater the resulting number's digits when added up will always be a multiple of nine... When you declare the noncircled numbers it is therefore easy to calculate the circled (hidden) digit as it is this one you would need to add to make a multiple of nine.... 
elko2
Joined: 24/07/2007 Posts: 4400
Message Posted: 19/11/2008 08:10  Join or Login to Reply  Message 18 of 22 in Discussion 
 Exactly. QED ismet 
Skogsy
Joined: 15/05/2008 Posts: 339
Message Posted: 19/11/2008 08:28  Join or Login to Reply  Message 19 of 22 in Discussion 
 Who has the lowest Erdős number then? Skogsy 
Groucho
Joined: 26/04/2008 Posts: 7993
Message Posted: 19/11/2008 14:22  Join or Login to Reply  Message 21 of 22 in Discussion 
 Pike, Indeed you managed to {expletive deleted} it up.... Didn't they do arithmetic at your borstal? 
mustafa
Joined: 18/11/2008 Posts: 9
Message Posted: 19/11/2008 14:24  Join or Login to Reply  Message 22 of 22 in Discussion 
 Very good,all my family are at it 
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