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Well we know the n is the number of charge carriers, A is cross-sectional area, v is drift velocity and Q/e is charge of electron. We could then go on to use the I to find the resistance. The formula could then be used to find the resistivity. The resistivity could be compared using values found in a lab, and the values found to be different from metal to metal. Of course this is not the best method, but it is one method.
n for metals is much higher then n for semiconductors which is much higher then for insulators 
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