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Maths Subject
The number we all use (1,2,3,etc)are known as arabic numbers to distinguishes them from the Roman numerals(??? etc),have you even thought why the "1" means one,and "2" means two......?the Roman...
let a, b be integers a, b> 0 let a= b ab= b^2 ab - a^2= b^2 - a^2 a(b - a)= (b + a)(b - a) a= b + a a= a + a a= 2a 1= 2