Two conductors have the same resistance ...

Two conductors have the same resistance at `0^(@)C` but their temperature coefficients of resistance are `alpha_(1) and alpha_(2)`. The respective temperature coefficients of their series and parallel combinations are nearly

`(alpha_(1)+alpha_(2))/2,alpha_(1)+alpha_(2)`

`alpha_(1)+alpha_(2),(alpha_(1)+alpha_(2))/2`

`alpha_(1)+alpha_(2),(alpha_(1)alpha_(2))/(alpha_(1)+alpha_(2))`

`(alpha_(1)+alpha_(2))/2,(alpha_(1)+alpha_(2))/2`

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