Two wires of equal diameters, of resistivities `rho_(1)` and `rho_(2)` and length `l_(1)` and `l_(2)`, respectively of the combination is

Two wires of equal diameters of resistivities rho_(1) and rho_(2) and length x_(1) and x_(2) respectively are joined in series. Find the equivalent resistivity of the combination.

Two wires of equal diameters of resistivies rho_(1) and rho_(2) and lengths l and l respectively are joined in series. The equivalent resistivity of the combination is

Two wires of equal diameters of resistivities p_1 and p_2 and length x_1 and x_2 respectively are joined in series. The equivalent resistivity of the combination is

Two wires of equal length and equal diameter and having resistivities rho_(1) and rho_(2) are connected in series. The equivalent resistivity of the combination is _______.

Two wires of equal length and equal diameter and having resisticities rho_(1) and rho_(2) are connected in series. The equivalent resistivity of the combination is .... .