Two conductors have the same resistance ...

Two conductors have the same resistance at `0^@C` but their temperature coefficient of resistanc 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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