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Find the equivalent resistance between points A and B.

If two resistors of 25 Ω and 15 Ω are joined together in series and then placed in parallel with a 40 Ω resistor, the effective resistance of the combination is :
(a) 0.1 Ω
(b) 10 Ω
(c) 20 Ω
(d)40 Ω
Calculate the equivalent resistance of the following combination of resistor r1, r2, r3, and r4

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The combinations having equivalent resistance 1 Q is/are ______.
