Help me please!!! задача с резистерами!!

Question

Help me please!!!
задача с резистерами!!

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Answer 1

R23=R2+R3=1+2=3 Ом
1/R234=1/R23+1/R4=1/3+1/10=13/30  R234= 2.3 Ом
R=R1+R234+R5=3+2.3+4= 9.3 Ом