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Two resistors with temperature coefficie...

Two resistors with temperature coefficient of 3 resistances `4*10^-3`/°C and `2*10^-3`/°C have of resistances `20` Omega and `10` Omega respectively at `0`°C. If they are connected in series, then equivalent temperature coefficient of resistor combination is

A

`8/3*10^(-23)`/°C

B

`6*10^(-3)` /°C

C

`4/3*10^(-3)`/°C`

D

`10/3*10^(-3) `/°C

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