# Thread: 4000 + 2000 = 0 ... ? ? ?

Join Date
Aug 2006
Posts
78

## 4000 + 2000 = 0 ... ? ? ?

Long ago, a mathematician used to cheat people. Once he borrowed \$ 4000/- from a rich man.
After a few days, he borrowed \$ 2000/- from the same man.

Many days passed, the mathematician did not return the money to the rich man.
The rich man went to the mathematician and asked to return the money.

But to his great surprise, the mathematician replied that there is no need to pay the debt.

"See here, friend" said the mathematician " the sum of 4000 and 2000 is equal to zero, so I do not have any balance to pay".

The rich man took the matter to the court. When the judge came to know this,he was astonished.
He asked the mathematician to prove that sum of

4000 and 2000 is zero, and not 6000.

The Clever mathematician agreed. He said:

let a = 4000,

b = 2000 and

c = 6000

a + b = c

Multiply both sides by a + b

(a + b) (a + b ) = c (a + b)

a*a + ab + ba + b*b = ca + cb

a*a + ab - ca = cb - b*b - ba

a( a + b -c) = -b(b + a - c)

so a = - b

a + b = 0

Hence 4000 + 2000 = 0.

2. Junior Member BizHat Newbie
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Aug 2006
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NOT FUNNY!This is no Joke!

3. Junior Member BizHat Newbie
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Aug 2006
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4. Junior Member BizHat Newbie
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Aug 2006
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haha...
even it is quite complicate, it's interesting

5. Junior Member BizHat Newbie
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Sep 2006
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ha ha ha.. 2 funny..

6. Member BizHat Newbie
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Sep 2006
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You got the phone numbre of the rich man? (considering a loan... ;))

7. Junior Member BizHat Newbie
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Sep 2006
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ha ha ha
It very funny.

8. Junior Member BizHat Newbie
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Oct 2006
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Lol, interesting joking.

9. Senior Member BizHat Geek
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Aug 2005
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India
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Interesting maths.
Thanks.

10. Junior Member BizHat Newbie
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Oct 2006
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ha ha ha
It very funny.

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