Consider the polynomial f(x)= 1+2x+3x^2+...

Consider the polynomial f`(x)= 1+2x+3x^2+4x^3`. Let s be the sum of all distinct real roots of `f(x)`and let `t= |s|`.

`(3/4,3)`

`(21/64,11/16)`

`(9,10)`

`(0,(21)/(64))`

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