Question

(a+b+c+d+e+f+g+h+i)^2 is expanded and simplified,how many different terms are in the final answer​

Answer 1

$a^{2} + b^{2} + c^{2} + d^{2} + e^{2} + f^{2} + g^{2} + h^{2} + 2(ab + ac + ad + ae + af + ag + ah + ai + bc + bd + be + bf + bg + bh + bi + cd + ce + cf + cg + ch + ci + de + df + dg + dh + di + ef + eg + eh + ei + fg + fh + fi + gh + gi + hi)$

Answer 2

Answer:

45

Step-by-step explanation: