, so that the
combination has a resistance of (i) 9 (ii) 2.
Answer:
(i) In order to get a resistance of 9 
from three resistors, each of
resistance 6 , we connect two resistors in
parallel and this parallel combination (or resistance 3) in series with the third
resistor as shown in fig.
(ii) In
order to get a resistance of 2 from three resistors, each of
resistance 6 , we connect all the three
resistors in parallel as shown in fig (b) as equivalent resistance in parallel
combination, i.e., Rp is given
by Rp = 
= 2.
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