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Let a , b , cRdot If f(x)=a x^2+b x+c ...

Let `a , b , cRdot` If `f(x)=a x^2+b x+c` is such that `a+b+c=3` and `f(x+y)=f(x)+f(y)+x y ,AAx ,yR ,` then `sum_(n=1)^(10)f(n)` is equal to `190` (2) `255` (3) `330` (4) `165`

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