Most of the people get confused after seeing 2=1. Even they know this is wrong but still they are not able to answer it. Actually they forget the basics of mathematics i.e. you can’t divide by zero(0).
Here is the same problem. You must know that you can’t divide anything by zero.
Solution:
In the above problem note the Step no. 7, in this step:
There it is cancelling the factor (a^2-ab) both sides, which is actually a zero (because in the first step it is taking a=b). This is wrong because we can’t do this according to basic mathematics rule.
Even if we follow the above rule we can also prove the result like (refer step2 where a^2 = ab):
2(0) = 3(0)
2 x 0 = 3 x 0
and if we can cancel both sides by zero(0), that means 2=3. So this is wrong. So always clear your basics of mathematics.
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