Problem:
What is the value of 9!11!β10!β?
Answer Choices:
A. 99
B. 100
C. 110
D. 121
E. 132
Solution:
9!11!β10!β=9!10!β
(11β1)β=9!10β
9!β
10β=100β
The problems on this page are the property of the MAA's American Mathematics Competitions