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Resistance of a circuit

When three resistors of resistance values R1, R2, and R3 are placed in a parallel pattern within an electrical circuit (see diagram attached), the total resistance, RT, is computed from the formula: 1/RT = 1/R1 + 1/R2 + 1/R3.

a. Rewrite the resistance formula by solving for RT and simplifying (i.e. RT = ...)

b. What is the total resistance of the circuit when resistors of 50, 100, and 200 ohms are placed in parallel? Write answer to 2 decimal places.

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This is a problem regarding resistance of a given circuit.

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