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# Hard math question! Can someone answer this?

#### Pavel123

##### Sempai
How is it possible that 1 + 1 = 1?

#### Supervin

##### 先輩
Ah, I remember this from high school - how nostalgic. It's a classic fallacy.

Let x = 1 and y = 1.

Then x = y

Squaring all gives x^2 = y^2

So x^2 - y^2 = 0

Factorizing gives (x - y)(x + y) = 0

Dividing all by (x - y) gives (x - y)(x + y)/(x - y) = 0/(x - y)

So x + y = 0

But x = 1 and y = 1, so 1 + 1 = 0

So 2 = 0

Dividing all by 2 gives 1 = 0

Adding 1 to all therefore gives:

1 + 1 = 1
QED

#### Pavel123

##### Sempai
You didn't solve the question.... Try again....

#### Supervin

##### 先輩
You didn't solve the question.... Try again....
OK, well normally 1 + 1 = 2.

But there exist people like Pavel123 who waste everybody's time.

So 1 + 1 goes nowhere and still equals 1, square one.
QED

#### Alex18

##### 後輩
It's a kind of a phylosophical question, not mathematical.

According to the bible, when a man and a woman marry and become united, they become one flesh together- so a man which is 1, and a woman which is also 1 become together.. guess again... that's right.. 1...

#### Supervin

##### 先輩
a man and a woman ... become united
I had considered that, but the thread title limited the question to math...

#### JimmySeal

##### Tubthumper
I had considered that, but the thread title limited the question to math...
You've obviously never listened to 2gether:
"I know my calculus. It says U + ME = US."

#### Mikawa Ossan

##### 気づいたらカッパだ
You didn't solve the question.... Try again....
Actually, I thought he did a rather good job of "solve(ing) the question".

How can 1+1=1?

Obviously the 1's involved are all of different sizes, just as some infinities are larger than others. #### EmperorHirohito

##### Who is Number One?
Think the answer may have been starring us in the face all the time but no-one could see it. Im not perfect at mathematics, I prefer physics and that sort of stuff, the general and specific theories of relativity are mind riviting things to read.
Anyway lets get back on topic lol. I think the answer lies in Biology and reproduction and a lovely little thing called Deoxyribonucleic acid, shortened to DNA. When one set of female DNA is joined by one set of male DNA, the result is one complete new set of DNA, either male or female.

Therefore 1+1 = 1. Quod Erat Demonstrandum.

Mind you another possible answer is that the numbers are Binary numbers where 1 plus 1 equals 1. Thats what MummyMia reckons.

#### JimmySeal

##### Tubthumper
In binary 1+1 = 10.

girls are evil

#### EmperorHirohito

##### Who is Number One?
In binary 1+1 = 10.
So it is, worked it out after I had posted that post. Also 3 is 11 in binary.

Pugtm, 10 out of 10 for that lol