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sr_erick
Senior Member
USA
1318 Posts |
 Posted - 12 November 2003 : 13:22:16
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http://digicc.com/fido/
Anyone, I need answers. It is making me crazy, I want to know how it can be so dang accurate. I just don't understand how it can work. |
Erick
Snowmobile Fanatics
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MarcelG
Retired Support Moderator
Netherlands
2625 Posts |
Posted - 12 November 2003 : 13:51:06
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What seems to work are two formulas:
1) one formula for numbers less than nine and
2) another for numbers larger than 9
For sum of numbers less than 9: Subtract 9 from the sum of the numbers given to Fido. That will be your answer.
example 1) if your numbers are 2331 and you circle 1 then (2+3+3) =8; 9-8 =1
example 2) 2430 and we circle 2 then (4+3)=7; 9-7=2
example 3) 4014 and we circle 4 then (4+1)=5; 9-5=4
If your number is larger than 9 then you need to subtract 9 from it until your subtracted number is less than 9 and then subtract nine again.
example 1) if your number is 7857 and you circle 5 then 7+8+7 = 22; 22-9 = 13; 13-9 = 4; 9-4=5
example 2) 3087 and you circle 8 then 7+3=10; 10-9=1; 9-1=8
example 3) 3762 and you circle 2 then 3+7+6=16; 16-9=7; 9-7=2 |
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sr_erick
Senior Member
USA
1318 Posts |
Posted - 12 November 2003 : 15:16:03
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Hmm, I will give it a whirl.  |
Erick
Snowmobile Fanatics
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Edited by - sr_erick on 12 November 2003 15:20:40 |
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sr_erick
Senior Member
USA
1318 Posts |
Posted - 12 November 2003 : 15:29:24
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| Hmm, still seems unclear, like it doesn't work on some of them like 2386 circling the 3? There must be another part to the formula. |
Erick
Snowmobile Fanatics
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Edited by - sr_erick on 12 November 2003 15:33:40 |
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Nikkol
Forum Moderator
USA
6907 Posts |
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Nikkol
Forum Moderator
USA
6907 Posts |
Posted - 12 November 2003 : 17:13:53
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when you take a number, jumble the digits, and then subtract these two numbers, the answer will always be a multiple of 9. 2386 is not a multiple of 9, so it doesn't apply in this case.
and a multiple of 9 is an interesting number, because all the digits in the number add up to another multiple of nine. so if you pick one digit out, then you can easilty figure out what that digit is by looking at the remaining digits. |
Nikkol ~ Help Us Help You | ReadMe | 3.4.03 fixes | security fixes ~ |
Edited by - Nikkol on 12 November 2003 17:17:43 |
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sr_erick
Senior Member
USA
1318 Posts |
Posted - 12 November 2003 : 19:23:59
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| AHH, that's what I was thinking! You can't just pick a random number and plug in, you have to pick a random number and follow the directions exactly. In that case the C++ program I wrote up with this logic is working just fine. |
Erick
Snowmobile Fanatics
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