Problem:
If a∣bc∣d​​=a⋅d−b⋅c, what is the value of 3∣41∣2​​?
Answer Choices:
A. −2
B. −1
C. 0
D. 1
E. 2
Solution:
3⋅2−4⋅1=6−4=2.
Answer: E​.
The problems on this page are the property of the MAA's American Mathematics Competitions