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Tip 1
When solving combination network-based problems, segregate sections of the network which are in series connection and those in parallel. Identify primary networks and then identify the secondary branches For example, in the given circuit, , and are in parallel.
As is in series with the rest, we can say

If four resistances are connected as shown in the fig. between A and B, the effective resistance is:
The resistance between A and B in the given figure will be(in ohm):