Problem:
3+6+9+⋯+512+4+6+⋯+34​=
Answer Choices:
A. 31​
B. 32​
C. 23​
D. 317​
E. 334​
Solution:
3+6+9+⋯+512+4+6+⋯+34​=3(1+2+3+⋯+17)2(1+2+3+⋯+17)​=32​.
Answer: B​.
The problems on this page are the property of the MAA's American Mathematics Competitions