Two identical resistors, each of 10 Ω , are connected in parallel. This combination, in turn, is connected to a third resistor of 10 Ω . The equivalent resistance of the combination is....
R1 and R2 are in parallel and R3 is in series arrangement.
$$R_{parallel}$$= $$\frac{R1\times R2}{R1+R2}$$
$$R_{series}$$= $$R_{parallel}$$+ R3]
=$$\frac{R1\times R2}{R1+R2}$$ + R3 = 15
Option C is correct.
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