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The resistance of two or more resistors in series is the sum of their resistances.

RS = sumI=1,N (RI)

The resistance of two or more resistors in parallel is the inverse of the sum of the inverses of the resistances. This is the same as saying that the conductance of two or more resistors in parallel is the sum of their conductances.

RP = 1 / sumI=1,N (1/RI)

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