# Solve this: Q.87. Let a, b, c $\in$ R. If f (x) = $a{x}^{2}+bx+c$ be such that a + b + c = 3 and f (x + y) = f (x) + f (y) + xy, $\forall$ x, y $\in$ R, then $\sum _{n=1}^{10}f\left(n\right)$ is equal to (a) 330 (b) 165 (c) 190 (d) 255

Dear student

Regards

• -1
What are you looking for?