What's wrong ?
Number Theory
Level
2
Denote 2 numbers a, b in which a=b, we have
- a=b
- aa=ab
- 2aa= aa+ab
- 2aa-2ab= aa-ab
- 2(aa- ab)=aa-ab
- 2=1 (?!) Where is it incorrect?
1
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4
6
5
3
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1 solution
Look carefully in the fifth step, aa-ab=aa-aa=0. In the other hand, we take aa-ab as the divisor.That means 0/0 = 0/0 (?!)