If in the given arrangement, the three resistors are to be replaced by a single
resistor. What will be the value of this resistor?

Dear student,
The two 6 ohm resistance are in parallel so their equivalent will beR' =6×66+6=3612 = 3ΩThis is in series with another 6 ohm resistance so Req = 6+3 = 9Ω

Option c is correct

Regards

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