SAT: Number problem

March 28, 2013 Ivy Zone

If p and n are integers such that p>n>0 and p^2 – n^2=12, which of the following can be the value of p-n?
I. 1
II. 2
III. 4
(A) I only
(B) II only
(C) I and II only
(D) II and III only
(E) I, II, and III


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