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F₁ : F₂ = 1/r₁² : 1/r₂²
= r₂² ; r₁²
F₁ : F₂ = 15² : 5²
= 9 : 1
9 F₂ = F₁
F₂ = 1/9 F₁ --> 1/9 gaya mula2