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For how many unique pairs of nonnegative integers \(\{a, b\}\) is the equation \(a^2 - b^2 = 225\) true?
A) 1
B) 3
C) 5
D) 7
E) 9
Answer: C
Source: Manhattan GMAT
A) 1
B) 3
C) 5
D) 7
E) 9
Answer: C
Source: Manhattan GMAT
