# Precalculus

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Question

The reciprocal of the combined resistance of two R1 and R2 connected in parallel is equal to the sum of the reciprocals of the individual resistances . If the two resistances are connected in series, their combined resistance is the sum of their individual resistance . If the two resistance connected in parallel have a combined resistance of 2.0 ohms and the same two resistance have a combined resistance of 9 ohms when connected in series, what is the resistance ? The two resistance are? Answers