* G12 = G1 + G2 = 1/6 + 1/20 = 13/60 S* G45 = G4 + G4 = 1/20 + 1/60 = 1/15 S* R45 = 1/G45 = 15 Ω* R345 = R3 + R45 = 15 + 15 = 30 Ω* G345 = 1/R345 = 1/30 S* Gtot = G345 + G12 = 1/30 + 13/60 = 1/4 S* Rtot = 1/Gtot = 4 Ω
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