Two wires of equal diameters, of resistivities ρ1 and ρ2 and lengths l1 and l2, respectively, are joined in series. The equivalent resistivity of the combination is 

(1) ρ1l1+ρ2l2l1+l2

(2) ρ1l2+ρ2l1l1l2

(3) ρ1l2+ρ2l1l1+l2

(4) ρ1l1ρ2l2l1l2 

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