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## Main Question or Discussion Point

**It seems strange?+x+x.....(x times)=x^2 then x=2x(differentiate wrt x)?**

x+x=2x

x+x+x=3x

x+x+x+x=4x

................

x+x+x+x+x+x+...(n times)=nx

x+x+x+x+x+x+...(x times)=x*x=x

^{2}

differentiate both sides with respect to x;

1+1+1+1+1+1...(x times)=2x

**x=2x**(what is it?)

what's wrong????