What is the correct answer?
4
A. (r₁² - r₂²)/(r₁ - r₂)
B. (r₁² - r₂²)/(r₁ + r₂)
C. (r₁³ - r₂³)/(r₁² - r₂²)
D. (r₁³ - r₂³)/(r₁ - r₂)
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