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Forget Cricket Talk about anything [within Board Rules, of course :) ]

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  #1  
Old November 23, 2003, 01:21 PM
Ehsan's Avatar
Ehsan Ehsan is offline
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Join Date: February 12, 2003
Location: Toronto
Posts: 5,275
Default Your Number!

The follwing calculation is for a tel number in Canada and US, don't know about other countries if it works. Got this in a forward e-mail, this thing really works.

1) Key in the first 3 digits of your phone
number into a calculator (do not key in your area code).
2) Multiply by 80.
3) Add 1.
4) Multiply by 250.
5) Plus last 4 digits of your phone number.
6) Plus last 4 digits of your phone number again.
7) Minus 250.
8) Divide by 2.
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  #2  
Old November 25, 2003, 10:24 PM
Shubho Shubho is offline
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Join Date: September 20, 2002
Location: Toronto, Canada
Posts: 1,892

hahahah, ehsan, man, that was hilarious.

a much simpler version of that would be to do the following:
1. Multiply first 3 digits by 10,000
2. Add last 4 digits

This is algebraically equivalent to what you just did.

Proof:

Let x = 'first 3 digits of telephone number'
Let y = 'last 4 digits of telephone number'

The steps as proposed by ehsan:
1. 80x
2. 80x + 1
3. (80x + 1)250
4. (80x + 1)250 + y
5. (80x + 1)250 + 2y
6. (80x + 1)250 + 2y - 250
7. ((80x + 1)250 + 2y - 250)0.5

Simplification of the above:
((80x + 1)250 + 2y - 250)0.5 = (20,000x + 250 + 2y - 250)0.5

= (20,000x + 2y)0.5

= 10,000x + y

The fact that I went through the trouble to post this shows that I am a lame idiot who has nothing better to do on Eid day. :P
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  #3  
Old November 25, 2003, 11:47 PM
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Orpheus Orpheus is offline
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Join Date: July 25, 2002
Favorite Player: Tamim, Riyad, Ashraful
Posts: 5,836

Quote:
this thing really works
Bravo! Ehsan Bravo! and your major is Engineering?

Good job Shubho on deriving the fomula... You are the fermat of Banglacricket!
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  #4  
Old November 26, 2003, 12:53 AM
chinaman chinaman is offline
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Join Date: August 14, 2003
Location: pc near u
Posts: 8,021

Better yet and of course without multiplication, write all the digits of your phone number from left to right in correct order. Now read the whole string. See?
Not bad, huh? Want to know how I was able to come up with the easiest formula? Well, I was the very best student in math of all the 4th graders in my school! Now top that.
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  #5  
Old November 26, 2003, 02:25 AM
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Carte Blanche Carte Blanche is offline
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Join Date: September 14, 2003
Location: Pacific
Posts: 2,498

hahahahaha chinaman
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