Two wires of the same dimensions but resistivities `rho_(1)` and `rho_(2)` are connected in series. The equivalent resistivity of the combination is

Two wires of same dimensions but resistivities rho_1 and rho_2 are connected in series. The equivalent resistivity of the combination is

Two wires of same dimension but resistivities rho_1 and rho_2 are connected in series. The equivalent resistivity of the combination is

Two wires of the same dimensions but resistivities p_(1) and p_(2) are connected in series. The equivalent resistivity of the combination is

Two wires of same dimension but resistivity p_(1) and p_(2) are connected in series. The equivalent resistivity of the combination is

Two wires of same dimension but resistivity p_(1) and p_(2) are connected in series. The equivalent resistivity of the combination is

The wires is of same dimension but resistivities rho_1 and rho_2 are connected in parallel . The equivalent resistivity of the combination is

The wires is of same dimension but resistivities rho_1 and rho_2 are connected in parallel . The equivalent resistivity of the combination is

The wire of same dimension but resistivities (p_1) and (p_2) are connected in parallel. 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 _______.