Two wires of same metal have same length...

Two wires of same metal have same length, but their cross sections are in the ratio 3 : 1. They are joined in series. The resistance of the thicker wire is `10 Omega` The total resistance of the combination is

`5/2 Omega`

`40/3 Omega`

`40 Omega`

`100 Omega`

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A, D

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