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= 6+8+4+2 ohm=20 ohm
3.
Rp=(R2+R3)+1/R4 + R1
Rp=(8+4) + 1/2 + 6
Rp=12+1/2 + 6
Rp=1/12+1/2 + 6
Rp=7/12 + 6
Rp=7/12 + 6/6
Rp=19/12=1 7/12 ohm.