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what is the highest , the lowest total resistance that can be secured by combinations of four coils of resistance 4ohm, 8ohm, 12ohm, 24ohm?
The highest resistance Rs =R1+R2+R3+R4
                                                      =48 ohm
The lowest resistance Rp   = 1/R1+1/R2+1/R3+1/R4
                                                     =1/2 ohm


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