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Old 09-14-2005, 10:30 PM   #1
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Default Weird number trick

try this one.....

Number trick
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Old 09-14-2005, 10:54 PM   #2
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Default Re: Weird number trick

Quote:
Originally Posted by dbeast420
try this one.....

Number trick
Nothing really freaky about it

Using some basic algebra where X is the first 3 digits of your phone number and Y is the last 4

( ( (X*80) + 1 ) * 250 ) + Y + Y - 250) /2

Which can simplify to
(20000*X + 250 + 2Y - 250) /2

Which simplifies to
(20000*X + 2Y) /2

Which is eqivalent to
10000*X + Y

So if you scale the first 3 digits of your phone number by 1000 and add the last 3 digits, you get the same thing
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Old 09-14-2005, 10:57 PM   #3
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Default Re: Weird number trick

Quote:
Originally Posted by 1995BvSSE
Quote:
Originally Posted by dbeast420
try this one.....

Number trick
Nothing really freaky about it

Using some basic algebra where X is the first 3 digits of your phone number and Y is the last 4

( ( (X*80) + 1 ) * 250 ) + Y + Y - 250) /2

Which can simplify to
(20000*X + 250 + 2Y - 250) /2

Which simplifies to
(20000*X + 2Y) /2

Which is eqivalent to
10000*X + Y

So if you scale the first 3 digits of your phone number by 1000 and add the last 3 digits, you get the same thing



Dang you're good.
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Old 09-14-2005, 11:01 PM   #4
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Default Re: Weird number trick

LOL, can you tell I spent 10 1/2 hours doing engineering work today? I didn't even have to THINK about this, it became a reflex. I think I need a vacation
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Old 09-15-2005, 12:22 AM   #5
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Default Re: Weird number trick

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Originally Posted by 1995BvSSE
LOL, can you tell I spent 10 1/2 hours doing engineering work today? I didn't even have to THINK about this, it became a reflex. I think I need a vacation
Damn Engineers!
Oh, wait, thats me.....
:P
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Old 09-15-2005, 12:26 AM   #6
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Default Re: Weird number trick

Quote:
Originally Posted by Puddy46
Quote:
Originally Posted by 1995BvSSE
LOL, can you tell I spent 10 1/2 hours doing engineering work today? I didn't even have to THINK about this, it became a reflex. I think I need a vacation
Damn Engineers!
Oh, wait, thats me.....
:P
Who needs mathematicians when you have engineers, right? "close enough" LOL
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Old 09-15-2005, 12:34 AM   #7
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Default Re: Weird number trick

Quote:
Originally Posted by 1995BvSSE
Quote:
Originally Posted by Puddy46
Quote:
Originally Posted by 1995BvSSE
LOL, can you tell I spent 10 1/2 hours doing engineering work today? I didn't even have to THINK about this, it became a reflex. I think I need a vacation
Damn Engineers!
Oh, wait, thats me.....
:P
Who needs mathematicians when you have engineers, right? "close enough" LOL
Everyone needs someone to pick on
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Old 09-15-2005, 02:22 AM   #8
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Default Re: Weird number trick

Quote:
Originally Posted by 1995BvSSE
Quote:
Originally Posted by dbeast420
try this one.....

Number trick
Nothing really freaky about it

Using some basic algebra where X is the first 3 digits of your phone number and Y is the last 4

( ( (X*80) + 1 ) * 250 ) + Y + Y - 250) /2

Which can simplify to
(20000*X + 250 + 2Y - 250) /2

Which simplifies to
(20000*X + 2Y) /2

Which is eqivalent to
10000*X + Y

So if you scale the first 3 digits of your phone number by 1000 and add the last 3 digits, you get the same thing
jeez, i'm in some hard core classes at the university of florida, and it would've taken me QUITE some time to figure that out.
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Old 09-15-2005, 09:52 AM   #9
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Default Re: Weird number trick

Quote:
Originally Posted by LakevilleSSEi
Quote:
Originally Posted by 1995BvSSE
Quote:
Originally Posted by dbeast420
try this one.....

Number trick
Nothing really freaky about it

Using some basic algebra where X is the first 3 digits of your phone number and Y is the last 4

( ( (X*80) + 1 ) * 250 ) + Y + Y - 250) /2

Which can simplify to
(20000*X + 250 + 2Y - 250) /2

Which simplifies to
(20000*X + 2Y) /2

Which is eqivalent to
10000*X + Y

So if you scale the first 3 digits of your phone number by 1000 and add the last 3 digits, you get the same thing



Dang you're good.
Whoops, I read over this again, and realized that my final statement should have said "if you scale the first 3 digits of your phone number by 10,000" (not 1000). Sorry, I goofed!
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Old 09-15-2005, 11:18 AM   #10
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Default

yeah, my wife looked at a similar one (using the year you're born) and was shocked...

so I did the same thing - I took her through the math of the whole thing, and she just looked at me. you know, that look that engineers get all the time from people who aren't, after we've described something that they don't understand?

that look.
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