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Length of wires =  L each
area of cross section of each  = A

Resistance R1 =  ρ1 L / A
                 R2 = ρ2 L / A

           As they are joined in series,  R = R1 + R2 = (ρ1 + ρ2) L / A

       So effective resistivity =  ρ1 + ρ2
3 5 3