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Let a,b,c in R.If f(x) = ax^2+bx +c is ...

Let `a,b,c in R.If f(x) = ax^2+bx +c ` is such that a +b+c =3 and `f(x+y)=f(x)+f(y)+xy,AA x,y in R, then underset(n=1)overset(10)Sigma f(n)` is equal to

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