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See
the pages on series and
parallel resistors
before reading this one.
 In the diagram we have
two sets of 10 ohms in
series with 15 ohms.These can be replaced by
two 25 ohms as shown in
the next diagram.
 The two 25 ohms are in
parallel and can be
replaced by 12.5 ohms.See the next diagram.
 The two 5 ohms are in
parallel so can be
simplified to 2.5 ohms.
See the next diagram.The 12.5 and the 2.5 are
in series so that the
equivalent resistance
for the network is 15
ohms.
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