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Country Discussion Topics
To add your comments to this topic, click on one of the 'Reply' links below.

Please check your phone number :)
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deadcarp    Posted 10-30-2003 at 15:53:55       [Reply]  [No Email]
I wrote down your phone number, then lost the note okay? but i think i have it right - could you check it for me? sorry about the math stuff but i didn't want to just type it out -------
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Ignore your area code and use only the 7 digit phone number.

Key in the 1st 3 digits of your phone number in a calculator, multiply by 80 then plus 1. Multiply by 250 plus the last 4 digits of your number plus the last 4 digits again minus 250. Divide by 2.

Is this your number? :)


toolman    Posted 10-30-2003 at 16:01:46       [Reply]  [No Email]
yup works everytime,how,d ya do that.


deadcarp- how?    Posted 10-31-2003 at 07:06:42       [Reply]  [No Email]
well i didn't dream this one up, but in truth it can be done in infinite different ways: here's the recipe --

Let N be your phone number.

It can be expressed as
N = A * 10000 + B
where A is the number composed of the first three digits, B is the number composed of the last four digits.

Key in the 1st 3 digits of your phone number in a calculator, multiply by 80 then plus 1.
A * 80 + 1

Multiply by 250
(A * 80 + 1) * 250

plus the last 4 digits of your number
((A * 80 + 1) * 250) + B

plus the last 4 digits again minus 250
((A * 80 + 1) * 250) + B + B - 250

Divide by 2.
(((A * 80 + 1) * 250) + B + B - 250) / 2

Expand using the usual rules of algebra:
((A * 80 * 250 + 1 * 250) + B + B - 250) / 2

((A * 80 * 250 + 1 * 250) + 2* B - 250) / 2

((A * 20000 + 250) + 2* B - 250) / 2

(A * 20000 + 250 + 2* B - 250) / 2

(A * 20000 + 2* B + 250 - 250) / 2

(A * 20000 + 2* B) / 2

(A * 10000 + 1* B)

A * 10000 + B = N the original number.

It's called algebraic identity :)


sven    Posted 10-31-2003 at 17:37:19       [Reply]  [No Email]
Darn, I was having fun until you went into all that detail, now my head hurts.


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