If c ≠ 1 and if dc/(d - c) = 1, what is the value of d in terms of c?
Choose the correct choice from the following answers:
A) (c-1)/c	B) c/(1-c)	C) c/(c + 1)	D) (c + 1)/c	E) (1 - c)/c
This question comes with a particular 'quirk' (one that you probably won't see on Test Day). The GMAT won't test you on the concept of undefined numbers (re: numbers divided by 0), so any time that this concept is a possibility, the question writers have to add a restriction that removes the option that a 0 could occur in the denominator.   Here, we're told that B CANNOT = 1, which is a bit strange because that restriction doesn't seem to impact the original equation much. In fact, it impacts JUST ONE of the answer choices - so you have to ask WHY that restriction is even there. It's actually because that one answer is the correct one.   Final Answer:   c/(1-c)
<result>B</result>
If c ≠ 1 and if dc/(d - c) = 1, what is the value of d in terms of c?