Engineering: Electrical Circuits?

Re-draw the circuit diagram as shown below.

Equivalent resistance Rdb
= 1 / {[1/(1 + 5)] + (1/4) + (1/12)} Ω
= 2 Ω

Equivalent resistance Rcb
= 1 / {[1/1 + 2] + (1/6) + (1/3)} Ω
= 1.2 Ω

Equivalent resistance Rab
= (10 + 1.2) Ω
= 11.2 Ω

Series parallels circuit. Google the equation, my pitiful HP laptop lacks a scientific keyboard. R + R over R X R. Ohms Law.

the 12 is//4=3Ω and the 6//3=2Ω.

5+1=6 //3=2  +1=3//2=6/5=1.2+10=11.2Ω Rab