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Source: Official Guide for the GMAT 12th Ed. Section 5.3 Problem Solving; #213

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In an electric circuit, two resistors with resistances

In an electric circuit, two resistors with resistances x and y are connected in parallel. In this case, if r is the combined resistance of these two resistors, then the reciprocal of r is equal to the sum of the reciprocals of x and y. What is r in terms of x and y?

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Mike McGarry, Magoosh Tutor

Nov 8, 2012 • Comment

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