Question 25
Let $a$, $b$ be positive integers that are prime to each other. What is the maximum value that the greatest common divisor between $(a+b)^4$ and $a-b$ can take?
(A) 3
(B) 4
(C) 16
(D) 32
(E) can be as large as you like.
(A) 3
(B) 4
(C) 16
(D) 32
(E) can be as large as you like.