If (a+b+c+d+e+f+g+h+i)^2 is expanded and simplified, how many different terms are in the final answer?
Answer Choices
A. 36
B. 9
C. 45
D. 81
E. 72
If (a+b+c+d+e+f+g+h+i)^2 is expanded and simplified, how many different terms are in the final answer?
Answer Choices
A. 36
B. 9
C. 45
D. 81
E. 72