Question

Why 1+1=2
Answer IT in detail

Answer 1

..suppose u have nothing and u a pen from a friend and now u have one nd then u get another pen from a another guy..then remain will add with it that's mean 1+1=2 hence u have two pens now..

Answer 2

4 Answers.You are thinking of the Principia Mathematica, written by Alfred North Whitehead and Bertrand Russell.Here is a relevant excerpt:As you can see,it ends with "From this proposition it will follow,when arithmetic addition has been defined,that 1+1=2."