Too many twos!
The equivalent resistance across & is of the form , where and are coprime positive integers, find .
The answer is 5.
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1 solution
Top most and bottom most resistances are short circuited hence for simplification we can remove them while the system of two central resistances can be clubbed in parallel to form a 1 ohm resistance.
Hence the circuit simplifies to a two 4 ohm and one 1 ohm resistance in parallel which when simplified gives 3 2 ohm. ∴ 2 + 3 = 5