Problem:
2000(20002000)=
Answer Choices:
A. 20002001
B. 40002000
C. 20004000
D. 4,000,0002000
E. 20004,000,000
Solution:
2000(20002000)=(20001)(20002000)=20001+2000=20002001. All the other options are greater than 20002001.
Answer: A​.
The problems on this page are the property of the MAA's American Mathematics Competitions