Please give detail solution and answer to Q.6

Dear student,
Range gives us the amount of voltage or current that can be measured and least count gives the least amount that can be measured. So higher range and lower least count is the best.
Milliammeter A1 and voltmeter V1 give maximum measuring range with the lowest least count. So, the combination of these two is best for two resistances connected in series.

The correct option is (a).
Regards

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