Problem B7: A resistor is made out of a certain material. The diameter of the resistor is d0, its length is l0, and its resistance is R0. Using the same material, another resister is made with diameter d=n1d0 and length n2l0. If the resistance of this resistor is n3R0, what is n3?

n1 = n2 = Input n3:
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Problem: