Reply
 
Thread Tools Search this Thread
 
Old 18 July 2006, 17:19   #1
Member
 
Andy Moore's Avatar
 
Country: UK - England
Town: Cowes, Isle of Wight
Boat name: TiLT 2
Make: Avon Adventure 620
Length: 6m +
Engine: Optimax 135
MMSI: 235032203
Join Date: Sep 2005
Posts: 1,639
How Does This Work Then?

http://break.com/index/pick_a_number.html
__________________

__________________
Andy Moore is offline   Reply With Quote
Old 18 July 2006, 18:09   #2
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
It didn't work for me-it got it wrong. Honest

It's based on a fairly simple mathematical progression actually, but as I'm feeling fairly simple in all this heat I can't think how to put it in writing
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 18 July 2006, 18:20   #3
RIBnet admin team
 
Poly's Avatar
 
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: 2 stroke YAM 20 HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 10,114
Any two digit number minus the sum of the two digits always gives an answer which is a multiple of 9. i.e. 9,18,27,...81

The table at the end has the same symbol for each of these numbers (9...81) and so it will always predict the correct symbol. To make it seem cleverer it randomises which symbol it uses each time you "play the game" so that you don't spot the pattern so easily.

The mathematical "proof" is that if you pick two digits a and b. Then the two digit number is 10a+b. If we call your answer q

10a + b - (a + b) = q
10a + b - a - b = q
9a = q

therefore q must be a multiple of 9.
__________________
Poly is offline   Reply With Quote
Old 18 July 2006, 19:14   #4
Member
 
Nasher's Avatar
 
Country: Other
Town: Principalite d'Chaos
Boat name: The Nashers Revenge!
Make: Ocean & Bombard
Length: 6m +
Engine: Suzi DT200EFI, DT9.9
MMSI: "Mmmmm SI" she said!
Join Date: Jan 2004
Posts: 4,147
Quote:
Originally Posted by Polwart
The mathematical "proof" is that if you pick two digits a and b. Then the two digit number is 10a+b. If we call your answer q

10a + b - (a + b) = q
10a + b - a - b = q
9a = q

therefore q must be a multiple of 9.
So how does this work then?
Its too hot and its after midnight.

Nasher.
__________________
RIBBED For extra pleasure.
Member of the ebay Blue RIB cover club.
Member of the Bombard 380 Aerotec club
Nasher is offline   Reply With Quote
Old 19 July 2006, 05:39   #5
Member
 
Andy Moore's Avatar
 
Country: UK - England
Town: Cowes, Isle of Wight
Boat name: TiLT 2
Make: Avon Adventure 620
Length: 6m +
Engine: Optimax 135
MMSI: 235032203
Join Date: Sep 2005
Posts: 1,639
Quote:
Originally Posted by Polwart
To make it seem cleverer it randomises which symbol it uses each time you "play the game" so that you don't spot the pattern so easily.
Ah, that's the cunning bit!
__________________
Andy Moore is offline   Reply With Quote
Old 19 July 2006, 09:56   #6
RIBnet admin team
 
Poly's Avatar
 
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: 2 stroke YAM 20 HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 10,114
Quote:
Originally Posted by Nasher
So how does this work then?
Its too hot and its after midnight.

Nasher.
Nasher - i'm not sure if you are winding me up - but I am avoiding work so I will answer you!

The instructions are: pick a two digit number, (for the sake of argument I will use 29 to illustrate my explanation, but it will work with any two digit number (that doesn't start with a zero!)). {in my mathematical "proof" above the first digit (a) is 2, and the second digit (b) is 9. So our two digit number is 10a+b = 29}

The instructions then say to add the two digits together (in our example that is 2+9=11) and subtract them from the original number. This is the number you have to look up the symbol for in their table. {in general terms this means we have to add a+b and subtract it from 10a+b}

In our example that gives us 29-11 = 18.

{In the mathematical proof that gives us our solution (which I called q) = 10a + b - (a+b), which when you rearrange the algebra gives q = 9a, and since a in an integer (it is the first digit of your two digit number) then 9a must be a multiple of 9}

If you look at the table - it "randomises" the symbols it allocates to each number so each time you play you seem to get a different number BUT 9,18,27,36,45,54,63,72,81 always have the mathcing symbols in each randomly generated table.

EDIT { actually this will work with a number starting with a zero - the answer, q, will be zero though and its not in the table they provide }
__________________
Poly is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 23:33.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.