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- ?Lv 51 decade agoFavorite Answer
R(r₁ + r₂) = r₁r₂
Rr₁ + Rr₂ − r₁r₂ = 0
Rr₂ − r₁r₂ = − Rr₁
r₂(R − r₁) = Rr₁
r₂ = Rr₁ / (R − r₁)
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