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How can three resistors of resistances 2...

How can three resistors of resistances `2Omega,3Omegaand6Omega` be connected to give a total resistance of a] `4Omega`. b] `1Omega` ?

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How can three resistors of resistances 2Omega,3Omega and 6Omega be connected to give a total resistance of (a) 4Omega (b) 1Omega

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