If a and b are different positive integers and a + b = a(a + b), then which of the following must be true?
I. a = 1
II. b = 1
III. b > a  Choose the correct choice from the following.
A) I only B) II only C) III only D) I and III E) I and II
a has to equal a squared, and that only works if a is 1. There are no positive integers less than 1, so I and III are correct.   Answer : I and III
<result>D</result>
If a and b are different positive integers and a + b = a(a + b), then which of the following must be true?
I. a = 1
II. b = 1
III. b > a