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What is 1 plus 1? Why 1?
In a brain teaser, 1+ 1 can be equal to (many answers).

1, 2, 3, 10, Wang, A, You, Shen, Tian, Feng,

In the mathematical calculation of 10,1+1= 2; It is also the foundation of the "Mathematics Building".

In binary mathematical calculation,1+1=10;

Why is 1+ 1 equal to 2?

This is defined by mathematicians, because the definition of 2 is the addition of two 1

That is, axiom, without proof.

It can also be proved by reduction to absurdity.

Is 1+ 1 equal to 3?

Many people associate it with the person who proves 1+ 1=2.

Chen Jingrun Goldbach conjecture is not equal to 1+ 1=2.

But "the sum of two prime numbers must be a sum number", abbreviated as 1+ 1=2.

That is to say, 1+ 1=2 is not this 1+ 1=2.