REMEMBER – If we make a combination of resistors in series then we will have maximum possible resistance and if we make a combination of resistors in parallel then we will have minimum possible resistance.
By using the rule mentioned above the maximum resistance will be only when these three resistors are in series which is 1+2+3 = 6, hence the maximum resistance will be 6Ω.
Now to evaluate the minimum resistance possible we have to place these resistors parallel to each other, so, applying the parallel equation to the resistors,
R = 6/11 Ω .
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