# Resistance and resistivity

A resistor is to have a constant resistance of 30(ohm), independent of temperature. For this, an aluminium resistor with resistance R1 at 0(celcius) is used in series with a carbon resistor with resistance R2 at 0(celcius). Evaluate R1 and R2, given that $$\alpha 1$$ is 3.9 x 10^-3 for aluminium and $$\alpha 2$$ is -0.5 x 10^-3 for carbon.

Can anyone give me some clues to solve this question? Thanks in advance.

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