Problem:
What is the value of the product
(1+11).(1+21).(1+31).(1+41).(1+51).(1+61)?
Answer Choices:
A. 67
B. 34
C. 27
D. 7
E. 8
Solution:
The product may be written as
2⋅23⋅34⋅45⋅56⋅67=7
Answer: D.
The problems on this page are the property of the MAA's American Mathematics Competitions