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Mathematics 10 Online
OpenStudy (anonymous):

If R is the total resistance of two resistors connected in parallel with resistances R1 and R2, then R=R1R2/R1+R2. If R1 is measured to be 20 ohms with a possible percentage error of 3 percent while R2 is measured to be 30 ohms with a possible percentage error of 5 percent, use differentials to estimate the maximum percentage error in the calculation of R.

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