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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 hahahaha 4000,
b hahahaha 2000 and
c hahahaha 6000
a + b hahahaha c
Multiply both sides by a + b
(a + b) (a + b ) hahahaha c (a + b)
a*a + ab + ba + b*b hahahaha ca + cb
a*a + ab - ca hahahaha cb - b*b - ba
a( a + b -c) hahahaha -b(b + a - c)
so a hahahaha - b
a + b hahahaha 0
Hence 4000 + 2000 = 0............
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