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When an electric current passes through two resistors with resistance rands, connected in parallel, the combined resistance,R R, can be calculated from the equation 1/R=1/r+1/s

When an electric current passes through two resistors with resistance rands, connected in parallel, the combined resistance,R

R, can be calculated from the equation

1/R=1/r+1/s

where R, r and s are positive. Assume that s is constant.

If we consider the interval a<_ r <_ b, where does R take on its global maximum AND minimum values?

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