For resistors in series, the equivalent resistance is of their values.

less than the sum
greater than the sum
the same as the sum
none of the above

The correct answer is "the same as the sum".

Explanation:

The expression for the equivalent resistance in the series combination of the circuit is as follows;

Here, R' is the equivalent resistance, are the resistances.

The expression for the equivalent resistance in the parallel combination of the circuit is as follows;

Here, R' is the equivalent resistance, are the resistances.

In the series combination of the circuit, the equivalent resistance is more than the equivalent resistance in the parallel combination of the circuit.

In the series combination of the circuit, the same amount of current flows across the resistance but the voltage is different across the resistances.

Therefore, for resistor in series, the equivalent resistance is the same as the sum.

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