r12=r1+r2=5+10=15 Ом
r34=r3+r4=4+6=10 Ом
r=r12*r34/(r12+r34)=15*10/(15+10)=6 Ом
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r12=r1+r2=5+10=15 Ом
r34=r3+r4=4+6=10 Ом
r=r12*r34/(r12+r34)=15*10/(15+10)=6 Ом
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