Diagram 1 shows a resistor connected in a circuit. Diagram 2 shows an identical resistor connected in parallel with the first resistor.
What is the combined resistance of the two resistors in diagram 2?

1 )
greater than in the circuit of diagram 1
less than in the circuit of diagram 1, but greater than zero
3 )
the same as in the circuit of diagram 1
4 )
zero
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