Problem:
If a∗b=a+ba×b for a,b positive integers, then what is 5∗10?
Answer Choices:
A. 103
B. 1
C. 2
D. 310
E. 50
Solution:
5∗10=5+105×10=1550=5×35×10=310.
Answer: D.
The problems on this page are the property of the MAA's American Mathematics Competitions