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OG2016 PS Practice #218.
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?
xy
x + y
1 / (x+y)
`(xy)/(x+y)`
`(x+y)/(xy)`
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