0=1 Proof | 1=2 Proof

We all know that 0 can never be equal to 1, and 1 can never be equal to 2. But using some tricky ways we can prove 0=1 and 1=2. And of course, there must be some mistakes in the proofs. Let’s find out below.

Table of Contents

0=1 Proof

First Proof of 0=1: To conclude 1=2, we will use an infinite series. See the below steps. You need to spot the mistakes in the proof.

Step 1: We have


Step 2: Write each zero on the right-hand side as 0=1-1. So we get that


Step 3: Rearrange the parentheses in the following way:


Step 4: Put -1+1=0 


So finally we get that


[Second Proof of 0=1]

Step 1: We have


Step 2: Rewriting it we obtain that


⇒ 3.4-3.4 = 4.4-4.4

Step 3: Taking commons we have


Step 4: Cancelling 4-4 from both sides, we get that

$3 \cdot \cancel{(4-4)}=4 \cdot \cancel{(4-4)}$

$\Rightarrow 3=4$

$\Rightarrow 3+0=3+1$

Thus, we have



[Third Proof of 0=1]

Step 1: We have


Step 2: Rewriting -20 of both sides we have


⇒ 42-4.9 = 52-5.9

Step 3: Adding 81/4 to both sides, we obtain

$4^2-4\cdot 9+\frac{81}{4}$ $=5^2-5\cdot 9 +\frac{81}{4}$

$\Rightarrow 4^2-2\cdot 2\cdot \frac{9}{2}+(\frac{9}{2})^2$ $=5^2-2\cdot 5\cdot \frac{9}{2}+(\frac{9}{2})^2$

$\Rightarrow (4-\frac{9}{2})^2=(5-\frac{9}{2})^2$

Step 4: Taking square roots on both sides, we have


Step 5: Cancelling 9/2 from both sides, we have


$\Rightarrow 4=5$

$\Rightarrow 4+0=4+1$

It follows that



1=2 Proof

First Proof of 1=2: In the first method, we will use algebra. We will follow the following steps to conclude 1=2. But this is not true. So there must be a mistake in the proof. You have to find them.

Step 1: Let a=b

Step 2: Multiplying both sides by a, we get


Step 3: Subtract b2 from both sides.


Step 4: Factorise both sides. Doing that we get


Step 5: Cancelling a-b from both sides, we have


Step 6: Put b in the place of a as we have a=b.


⇒ 2b=b


Second Proof of 1=2: To prove 1=2, we will now use the theory of calculus. First, observe the following patterns:

22=2+2 (2 times)

32=3+3+3 (3 times)

42=4+4+4+4 (4 times)

$\vdots \quad \vdots \quad \vdots$

$x^2=x+x+\cdots +x$ (x times)

Differentiating both sides with respect to x, we get

$\dfrac{d}{dx}(x^2)$ $=\dfrac{d}{dx}(x)+\dfrac{d}{dx}(x)+\cdots +\dfrac{d}{dx}(x)$

$\Rightarrow 2x=1+1+\cdots +1$ (x times)

$\Rightarrow 2x=x$

$\Rightarrow 2=1$

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