Question: The formula 1 / R = R / R1 + 1 / R2 + 1/ R3 gives the total resistance R in an electric circuit

The formula 1 / R = R / R1 + 1 / R2 + 1/ R3 gives the total resistance R in an electric circuit due to three resistances, R1, R2, and R3, connected in parallel. If 10 ≤ R1 ≤ 20, 20 ≤ R2 ≤ 30, and 30 ≤ R3 ≤ 40, find the range of values for R.

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