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1. X = Y let x=y
2. X*X = XY multiply by x on both sides
3. X*X  Y*Y = XY  Y*Y subtract y*y from both sides
4. (X+Y)(XY) = Y(XY) factorise
5. (X+Y) = Y divide by (xy) on both sides
6. Y+Y = Y replace x with y
7. 2Y = Y factorise
8. 2 = 1 divide by y on both sides
Where lies the flaw in the logic?
[Puzzle Code = ZIHG]
Direct Link: www.brainbashers.com?ZIHG
Hint:
Answer: On line 4 we are dividing both sides by (XY), now, since X=Y, this is 0. We are not allowed to divide by zero. This leads to a meaningless conclusion.
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